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122-764: Star Cement (formerly known as Cement Manufacturing Company ) is a cement manufacturing company in India and the largest cement manufacturer in Northeast India . It was founded by Sajjan Bhajanka and Sanjay Agarwal on 2 November 2001 under the name "Cement Manufacturing Company Limited". The company is engaged in the sale and manufacturing of cement. Star Cement's manufacturing plants are located in Khliehriat and Guwahati . The company has occupied more than 500 to 1,000 hectares of land in Jaintia Hills district . It obtains coal from
244-417: A perfect fourth ) and octaves . Ptolemy reviewed standard (and ancient, disused ) musical tuning practice of his day, which he then compared to his own subdivisions of the tetrachord and the octave , which he derived experimentally using a monochord / harmonic canon. The volume ends with a more speculative exposition of the relationships between harmony, the soul ( psyche ), and the planets ( harmony of
366-596: A subtropical climate that is influenced by its relief and influences from the southwest and northeast monsoons . The Himalayas to the north, the Meghalaya plateau to the south and the hills of Nagaland, Mizoram and Manipur to the east influences the climate. Since monsoon winds originating from the Bay of Bengal move northeast, these mountains force the moist winds upwards, causing them to cool adiabatically and condense into clouds, releasing heavy precipitation on these slopes. It
488-601: A Roman citizen, but was ethnically either a Greek or at least a Hellenized Egyptian. Astronomy was the subject to which Ptolemy devoted the most time and effort; about half of all the works that survived deal with astronomical matters, and even others such as the Geography and the Tetrabiblos have significant references to astronomy. Ptolemy's Mathēmatikē Syntaxis ( Greek : Μαθηματικὴ Σύνταξις , lit. ' Mathematical Systematic Treatise ' ), better known as
610-511: A capacity of 4 million tonnes to grinding and donated 10 million to Assam CM’s Relief Fund. Northeast India Northeast India , officially the North Eastern Region ( NER ), is the easternmost region of India representing both a geographic and political administrative division of the country. It comprises eight states — Arunachal Pradesh , Assam , Manipur , Meghalaya , Mizoram , Nagaland and Tripura (commonly known as
732-399: A center of rice germplasm. The National Bureau of Plant Genetic Resources (NBPGR), India, has highlighted the region as being rich in wild relatives of crop plants. It is the center of origin of citrus fruits. Two primitive variety of maize, Sikkim Primitive 1 and 2, have been reported from Sikkim (Dhawan, 1964). Although jhum cultivation , a traditional system of agriculture, is often cited as
854-470: A coherent mathematical description, which persists to the present as just intonation – the standard for comparison of consonance in the many other, less-than exact but more facile compromise tuning systems. During the Renaissance , Ptolemy's ideas inspired Kepler in his own musings on the harmony of the world ( Harmonice Mundi , Appendix to Book V). The Optica ( Koine Greek : Ὀπτικά ), known as
976-602: A decisive defeat for the Japanese. They suffered heavy casualties and were forced to retreat, marking a turning point in the Burma Campaign. The Allied victory paved the way for subsequent offensives to clear Japanese forces from Burma and ultimately led to the re-conquest of the region. Arunachal Pradesh, a state in the Northeastern tip of India, is claimed by China as South Tibet . Sino-Indian relations degraded, resulting in
1098-402: A handful of places. Ptolemy's real innovation, however, occurs in the second part of the book, where he provides a catalogue of 8,000 localities he collected from Marinus and others, the biggest such database from antiquity. About 6 300 of these places and geographic features have assigned coordinates so that they can be placed in a grid that spanned the globe. Latitude was measured from
1220-492: A long exposition on the relationship between reason and sense perception in corroborating theoretical assumptions. After criticizing the approaches of his predecessors, Ptolemy argues for basing musical intervals on mathematical ratios (as opposed to the ideas advocated by followers of Aristoxenus ), backed up by empirical observation (in contrast to the excessively theoretical approach of the Pythagoreans ). Ptolemy introduces
1342-587: A method for specifying the location of the Sun in three pairs of locally oriented coordinate arcs as a function of the declination of the Sun, the terrestrial latitude, and the hour. The key to the approach is to represent the solid configuration in a plane diagram that Ptolemy calls the analemma . In another work, the Phaseis ( Risings of the Fixed Stars ), Ptolemy gave a parapegma , a star calendar or almanac , based on
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#17331068822251464-461: A much later pseudepigraphical composition. The identity and date of the actual author of the work, referred to now as Pseudo-Ptolemy , remains the subject of conjecture. Ptolemy wrote a work entitled Harmonikon ( Greek : Ἁρμονικόν ), known as the Harmonics , on music theory and the mathematics behind musical scales in three books. Harmonics begins with a definition of harmonic theory, with
1586-659: A number of features that set them apart from most other areas of the Indian subcontinent (such as alveolar consonants rather than the more typical dental/retroflex distinction). Assamese , an Indo-Aryan language spoken mostly in the Brahmaputra Valley , developed as a lingua franca for many speech communities. Assamese-based pidgin/creoles have developed in Nagaland ( Nagamese ) and Arunachal ( Nefamese ), though Nefamese has been replaced by Hindi in recent times. Bengali language
1708-410: A predominantly humid sub-tropical climate with hot, humid summers, severe monsoons, and mild winters. Along with the west coast of India, this region has some of the Indian subcontinent's last remaining rainforests, which support diverse flora and fauna and several crop species. Reserves of petroleum and natural gas in the region are estimated to constitute a fifth of India's total potential. The region
1830-723: A radio talk show. He later compiled a book on the interdependence and commonness of the Seven Sister States. It has been primarily because of this publication that the nickname has caught on. The Northeast region can be physiographically categorised into the Eastern Himalaya , the Patkai and the Brahmaputra and the Barak valley plains. Northeast India (at the confluence of Indo-Malayan, Indo-Chinese, and Indian biogeographical realms) has
1952-420: A reason for the loss of forest cover of the region, this primary agricultural economic activity practised by local tribes supported the cultivation of 35 varieties of crops. The region is rich in medicinal plants and many other rare and endangered taxa . Its high endemism in both higher plants , vertebrates , and avian diversity has qualified it as a biodiversity hotspot . The following figures highlight
2074-521: A significant increase in musical innovation in the 21st century. Many of the Northeast Indian indigenous communities have an ancient heritage of folktales which tell the tale of their origin, rituals, beliefs and so on. These tales are transmitted from one generation to another in oral form. They are remarkable instances of tribal wisdom and imagination. However, Assam, Tripura and Manipur have some ancient written texts. These states were mentioned in
2196-542: A southward occurrence of this mountain range in comparison to other Himalayan ranges, this region has a distinctly different climate, with warmer mean temperatures and fewer days with frost, and much higher rainfall. This has resulted in the occurrence of a rich array of restricted-range bird species. More than two critically endangered species, three endangered species, and 14 vulnerable species of birds are in this EBA. Stattersfield et al. (1998) identified 22 restricted range species, out of which 19 are confined to this region and
2318-543: A temple at Canopus , around 146–147 AD, known as the Canobic Inscription . Although the inscription has not survived, someone in the sixth century transcribed it, and manuscript copies preserved it through the Middle Ages. It begins: "To the saviour god, Claudius Ptolemy (dedicates) the first principles and models of astronomy", following by a catalogue of numbers that define a system of celestial mechanics governing
2440-478: A thousand years or more". It was first translated from Arabic into Latin by Plato of Tivoli (Tiburtinus) in 1138, while he was in Spain. Much of the content of the Tetrabiblos was collected from earlier sources; Ptolemy's achievement was to order his material in a systematic way, showing how the subject could, in his view, be rationalized. It is, indeed, presented as the second part of the study of astronomy of which
2562-457: A travelling Chinese Buddhist monk, visited Kamarupa in the 7th century CE. He described the people as "short in stature and black-looking", whose speech differed a little from mid-India and who were of simple but violent disposition. He wrote that the people in Kamarupa knew of Sichuan , which lay to the kingdom's east beyond a treacherous mountain. The northeastern states were established during
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#17331068822252684-553: A view supported by the Stoics. Although mainly known for his contributions to astronomy and other scientific subjects, Ptolemy also engaged in epistemological and psychological discussions across his corpus. He wrote a short essay entitled On the Criterion and Hegemonikon ( Greek : Περὶ Κριτηρίου καὶ Ἡγεμονικοῡ ), which may have been one of his earliest works. Ptolemy deals specifically with how humans obtain scientific knowledge (i.e.,
2806-535: A year. Areas in the Brahmputra valley receive 2,000 mm (79 in) of rainfall a year while mountainous areas receive 2,000 to 3,000 mm (79 to 118 in) a year. The southwest monsoon is responsible for bringing 90% of the annual rainfall to the region. April to late October are the months where most of the rainfall in Northeast India occurs with June and July being the rainiest months. In most parts of
2928-541: Is 46 million with 68 per cent of that living in Assam alone. Assam also has a higher population density of 397 persons per km than the national average of 382 persons per km . The literacy rates in the states of the Northeastern region, except those in Arunachal Pradesh and Assam, are higher than the national average of 74 per cent. As per 2011 census, Meghalaya recorded the highest population growth of 27.8 per cent among all
3050-399: Is a famous industry in the region. Northeast is a hub of different genres of music. Each community has its own rich heritage of folk music. Talented musicians and singers are plentifully found in this part of the country. The Assamese singer-composer Bhupen Hazarika achieved national and international fame with his remarkable creations. Another famous singer from Assam, Pratima Barua Pandey
3172-419: Is a mega-earthquake prone zone caused by active fault planes beneath formed by the convergence of three tectonic plates viz. India Plate , Eurasian Plate and Burma Plate . Historically the region has suffered from two great earthquakes (M > 8.0) – 1897 Assam earthquake and 1950 Assam-Tibet earthquake – and about 20 large earthquakes (8.0 > M > 7.0) since 1897. The 1950 Assam-Tibet earthquake
3294-631: Is a popular term for the contiguous states of Arunachal Pradesh , Assam , Meghalaya , Manipur , Mizoram , Nagaland and Tripura prior to inclusion of the state of Sikkim into the North Eastern Region of India. The sobriquet 'Land of the Seven Sisters' was coined to coincide with the inauguration of the new states in January 1972 by Jyoti Prasad Saikia, a journalist in Tripura, in the course of
3416-562: Is a well-known folk singer. Zubeen Garg , Papon , Anurag Saikia are some other notable singers, musicians from the state of Assam . Tangkhul Naga folk blue singer like Rewben Mashangva , who comes from Ukhrul, is an acclaimed Folk singer whose music is inspired by the like of Bob Dylan and Bob Marley. Another famous folk singing band from Nagaland popularly known as Tetseo Sisters is one to be noted for their original music genre. However, younger generation has started pursuing western music more and more nowadays. The northeast region has seen
3538-563: Is an acclaimed Assamese writer whose novels include Moth-Eaten Howda of the Tusker , Pages Stained with Blood , The Shadow of Kamakhya and The Blue-Necked God . Mamang Dai won the Sahitya Akademi Award (2017) for her novel The Black Hill . Ptolemy Claudius Ptolemy ( / ˈ t ɒ l ə m i / ; Ancient Greek : Πτολεμαῖος , Ptolemaios ; Latin : Claudius Ptolemaeus ; c. 100 – c. 170 AD)
3660-572: Is ancestral to the modern system of constellations but, unlike the modern system, they did not cover the whole sky (only what could be seen with the naked eye in the northern hemisphere). For over a thousand years, the Almagest was the authoritative text on astronomy across Europe, the Middle East, and North Africa. The Almagest was preserved, like many extant Greek scientific works, in Arabic manuscripts;
3782-1544: Is another Indo-Aryan language spoken in South Assam in the Barak Valley and Tripura , being the majority and official language in both the regions. The Austro-Asiatic family is represented by the Khasi , Jaintia and War languages of Meghalaya. A small number of Tai–Kadai languages ( Ahom , Tai Phake , Khamti , etc.) are also spoken. Sino-Tibetan is represented by a number of languages that differ significantly from each other, some of which are: Boro , Rabha , Karbi , Mising , Tiwa , Deori , Hmar (including Biate, Chorei, Halam, Hrangkhawl, Kaipeng, Molsom, Ranglong, Saihriem, Sakachep, Thangachep, Thiek) , Zeme Naga , Rengma Naga and, Kuki ( Thadou language ) (Assam); Garo , Rabha , Hmar (including Biate, Sakachep) (Meghalaya); Ao , Angami , Sema , Lotha , Konyak , Chakhesang , Chang , Khiamniungan , Phom , Pochury , Rengma , Sangtam , Tikhir , Yimkhiung , Zeliang , Kuki ( Thadou ), and Hmar (including Sakachep/Khelma) etc. (Nagaland); Mizo languages such as Lusei (including Hualngo) , Hmar (including Chorei, Darlawng, Darngawn, Kaipeng, Khawlhring, Molsom, Ngente, Sakachep, Zote) , Lai (including Hakha, Falam, Khualsim, Zanniet, Sim) , Mara languages , Ralte/Galte , Zomi/Paihte , Kuki/Thahdo , etc. (Mizoram); Hrusso , Tanee , Niyshi , Adi , Abor, Nocte , Apatani , Mishmi etc. (Arunachal). Kokborok
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3904-597: Is concentrated in that state alone. A bulk of Christian population in India resides in North East, as about 30% of India's Christian population is concentrated in North Eastern region alone. There is a significant presence of Buddhism in Sikkim , Arunachal Pradesh and Mizoram . Northeast India has over 220 ethnic groups and an equal number of dialects in which Bodo form the largest indigenous ethnic group. The hills states in
4026-517: Is covered by the mighty Brahmaputra-Barak river systems and their tributaries. Geographically, apart from the Brahmaputra , Barak and Imphal valleys and some flatlands in between the hills of Meghalaya and Tripura , the remaining two-thirds of the area is hilly terrain interspersed with valleys and plains; the altitude varies from almost sea-level to over 7,000 metres (23,000 ft) above MSL . The region's high rainfall, averaging around 10,000 millimetres (390 in) and above creates problems of
4148-576: Is due to temperature inversions during winter nights when cold air descends from the hills into the valleys below and its geographic location which prevents winds that bring hot temperatures and humidity from coming into the Manipur plain. For example, in Imphal, winter daytime temperatures hover around 21 °C (70 °F) but nighttime temperatures drop to 3 °C (37 °F). No part of Northeast India receives less than 1,000 mm (39 in) of rainfall
4270-672: Is his Geographike Hyphegesis ( Greek : Γεωγραφικὴ Ὑφήγησις ; lit. ' Guide to Drawing the Earth ' ), known as the Geography , a handbook on how to draw maps using geographical coordinates for parts of the Roman world known at the time. He relied on previous work by an earlier geographer, Marinus of Tyre , as well as on gazetteers of the Roman and ancient Persian Empire . He also acknowledged ancient astronomer Hipparchus for having provided
4392-578: Is of Homeric form . It was common among the Macedonian upper class at the time of Alexander the Great and there were several of this name among Alexander's army, one of whom made himself pharaoh in 323 BC: Ptolemy I Soter , the first pharaoh of the Ptolemaic Kingdom . Almost all subsequent pharaohs of Egypt, with a few exceptions, were named Ptolemy until Egypt became a Roman province in 30 BC, ending
4514-614: Is one-horned rhinoceros. The forests of the region are also the habitats of elephant, royal Bengal tiger, leopard, golden cat, fishing cat, marbled cat, Bengal fox etc. the Gangetic dolphin in the Brahmaputra is also an endangered species. The other endangered species are otter, mugger crocodile, tortoise and some fishes. WWF has identified the following priority ecoregions in North-East India: The total population of Northeast India
4636-487: Is still the largest earthquake in India . WWF has identified the entire Eastern Himalayas as a priority Global 200 ecoregion . Conservation International has upscaled the Eastern Himalaya hotspot to include all the eight states of Northeast India, along with the neighbouring countries of Bhutan , southern China and Myanmar . The region has been identified by the Indian Council of Agricultural Research as
4758-622: Is the Geography , which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world . The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day. This is sometimes known as the Apotelesmatika ( Greek : Αποτελεσματικά , lit. ' On the Effects ' ) but more commonly known as
4880-412: Is the dominant among the tribal people of Tripura and one of the official languages of the state, while Garo , Hmar (including Bong, Bongcher, Chorei, Dab, Darlawng, Hmarchaphang, Hrangkhawl, Langkai, Kaipeng, Koloi, Korbong, Molsom, Ranglong, Rupini, Saihmar, Sakachep, Thangachep)) , Lusei (including Rokhum) , etc are also spoken. Meitei is the official language in Manipur, the dominant language of
5002-538: Is the first writer from Northeast India to be awarded the Sahitya Akademi Award (2013) in the Indian English Literature category for her collection of short stories, Laburnum for My Head , and Padma Shri (2007). Easterine Kire is the first English novelist hailed from Nagaland. She received The Hindu Literary Prize (2015) for her novel When the River Sleeps . Indira Goswami, alias Mamoni Roisom Goswami,
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5124-569: Is the majority religion in the North Eastern states of Assam , Tripura , Manipur , Sikkim and plurality in Arunachal Pradesh , while Christianity is the majority religion in Meghalaya , Nagaland , Mizoram and plurality in Manipur and Arunachal Pradesh. A significant plurality of the state of Arunachal Pradesh follows the indigenous religion Donyi-Polo . Islam has a significant presence in Assam and about 93% of all North East Muslim population
5246-464: Is the rainiest region in the country, with many places receiving an average annual precipitation of 2,000 mm (79 in), which is mostly concentrated in summer during the monsoon season . Cherrapunji , located on the Meghalaya plateau is one of the rainiest place in the world with an annual precipitation of 11,777 mm (463.7 in). Temperatures are moderate in the Brahmaputra and Barak valley river plains which decreases with altitude in
5368-462: The Almagest , is the only surviving comprehensive ancient treatise on astronomy. Although Babylonian astronomers had developed arithmetical techniques for calculating and predicting astronomical phenomena, these were not based on any underlying model of the heavens; early Greek astronomers, on the other hand, provided qualitative geometrical models to "save the appearances" of celestial phenomena without
5490-562: The Tetrábiblos , from the Koine Greek meaning "Four Books", or by its Latin equivalent Quadripartite . The Catholic Church promoted his work, which included the only mathematically sound geocentric model of the Solar System , and unlike most Greek mathematicians , Ptolemy's writings (foremost the Almagest ) never ceased to be copied or commented upon, both in late antiquity and in
5612-405: The "Seven Sisters" ), and the "brother" state of Sikkim . The region shares an international border of 5,182 kilometres (3,220 mi) (about 99 per cent of its total geographical boundary) with several neighbouring countries – 1,395 kilometres (867 mi) with China in the north, 1,640 kilometres (1,020 mi) with Myanmar in the east, 1,596 kilometres (992 mi) with Bangladesh in
5734-662: The Almagest was the first, concerned with the influences of the celestial bodies in the sublunary sphere . Thus explanations of a sort are provided for the astrological effects of the planets , based upon their combined effects of heating, cooling, moistening, and drying. Ptolemy dismisses other astrological practices, such as considering the numerological significance of names, that he believed to be without sound basis, and leaves out popular topics, such as electional astrology (interpreting astrological charts to determine courses of action) and medical astrology , for similar reasons. The great respect in which later astrologers held
5856-557: The British Raj of the 19th and early 20th centuries, when they became relatively isolated from traditional trading partners such as Bhutan and Myanmar . Many of the peoples in present-day Mizoram, Meghalaya and Nagaland converted to Christianity under the influence of British (Welsh) missionaries. Since the Moamoria disturbances , the Ahom dynasty was on the decline. The British appeared on
5978-476: The Gangetic Plains as well as Kra–Dai speakers from southern Yunnan and Shan State . Due to the biodiversity and crop diversity of the region, archaeological researchers believe that early settlers of Northeast India had domesticated several important plants. Historians believe that the 100 BCE writings of Chinese explorer Zhang Qian indicate an early trade route via Northeast India. The Periplus of
6100-410: The Geography is likely to be of different dates, in addition to containing many scribal errors. However, although the regional and world maps in surviving manuscripts date from c. 1300 AD (after the text was rediscovered by Maximus Planudes ), there are some scholars who think that such maps go back to Ptolemy himself. Ptolemy wrote an astrological treatise, in four parts, known by
6222-645: The Middle Ages . However, it is likely that only a few truly mastered the mathematics necessary to understand his works, as evidenced particularly by the many abridged and watered-down introductions to Ptolemy's astronomy that were popular among the Arabs and Byzantines. His work on epicycles has come to symbolize a very complex theoretical model built in order to explain a false assumption. Ptolemy's date of birth and birthplace are both unknown. The 14th-century astronomer Theodore Meliteniotes wrote that Ptolemy's birthplace
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#17331068822256344-784: The Optics, is a work that survives only in a somewhat poor Latin version, which, in turn, was translated from a lost Arabic version by Eugenius of Palermo ( c. 1154 ). In it, Ptolemy writes about properties of sight (not light), including reflection , refraction , and colour . The work is a significant part of the early history of optics and influenced the more famous and superior 11th-century Book of Optics by Ibn al-Haytham . Ptolemy offered explanations for many phenomena concerning illumination and colour, size, shape, movement, and binocular vision. He also divided illusions into those caused by physical or optical factors and those caused by judgmental factors. He offered an obscure explanation of
6466-609: The Sahitya Akademi . Some of the notable writers of Northeast Literature are--(from Assam) Lakshminath Bezbaroa , Homen Borgohain , Birendra Kumar Bhattacharya , Harekrishna Deka , Rongbong Terang , Nilmani Phukan , Indira Goswami , Hiren Bhattacharyya , Mitra Phukan , Jahnavi Barua , Dhruba Hazarika , Rita Chowdhury ; (from Arunachal Pradesh) Mamang Dai ; (from Manipur) Robin S Ngangom , Ratan Thiyam ; (from Meghalaya) Paul Lyngdoh ; (from Nagaland) Temsula Ao , Easterine Kire ; (from Sikkim) Rajendra Bhandari . Temsula Ao
6588-669: The Sino-Indian War of 1962. The cause of the escalation into war is still disputed by both Chinese and Indian sources. During the war in 1962, the PRC (China) captured much of the NEFA ( North-East Frontier Agency ) created by India in 1954. But on 21 November 1962, China declared a unilateral ceasefire, and withdrew its troops 20 kilometres (12 mi) behind the McMahon Line . China returned Indian prisoners of war in 1963. The Seven Sister States
6710-457: The Tetrabiblos derived from its nature as an exposition of theory, rather than as a manual. A collection of one hundred aphorisms about astrology called the Centiloquium , ascribed to Ptolemy, was widely reproduced and commented on by Arabic, Latin, and Hebrew scholars, and often bound together in medieval manuscripts after the Tetrabiblos as a kind of summation. It is now believed to be
6832-461: The equator , as it is today, but Ptolemy preferred to express it as climata , the length of the longest day rather than degrees of arc : The length of the midsummer day increases from 12h to 24h as one goes from the equator to the polar circle . One of the places Ptolemy noted specific coordinates for was the now-lost stone tower which marked the midpoint on the ancient Silk Road , and which scholars have been trying to locate ever since. In
6954-519: The harmonic canon (Greek name) or monochord (Latin name), which is an experimental musical apparatus that he used to measure relative pitches, and used to describe to his readers how to demonstrate the relations discussed in the following chapters for themselves. After the early exposition on to build and use monochord to test proposed tuning systems, Ptolemy proceeds to discuss Pythagorean tuning (and how to demonstrate that their idealized musical scale fails in practice). The Pythagoreans believed that
7076-430: The "criterion" of truth), as well as with the nature and structure of the human psyche or soul, particularly its ruling faculty (i.e., the hegemonikon ). Ptolemy argues that, to arrive at the truth, one should use both reason and sense perception in ways that complement each other. On the Criterion is also noteworthy for being the only one of Ptolemy's works that is devoid of mathematics . Elsewhere, Ptolemy affirms
7198-552: The Brahmaputra and Barak valley river plains, mean winter temperatures vary between 16 and 17 °C (61 and 63 °F) while mean summer temperatures are around 28 °C (82 °F). The highest summer temperatures occur in the West Tripura plain with Agartala , the capital of Tripura having mean maximum summer temperatures ranging between 33 and 35 °C (91 and 95 °F) in April. The highest temperatures in summer occur before
7320-681: The British formed the South East Asia Command (SEAC) under Admiral Lord Louis Mountbatten in November 1943. This command brought new energy to the war effort in the region and emphasised the importance of standing firm and fighting on despite logistical challenges, such as during the monsoon season. The Japanese launched an offensive in March 1944 aimed at capturing Imphal and Kohima, key locations in northeast India. Capturing these areas would have allowed
7442-568: The Cachar plains south of 25 o N and are classified as tropical wet and dry ( Aw ). Much of Assam, Nagaland, northern parts of Meghalaya and Manipur and parts of Arunachal Pradesh fall within the warm temperature mesothermal climates (type C) where the mean temperatures in coldest months range from −3 to 18 °C (27 to 64 °F). The entire Brahmaputra valley has a humid subtropical climate ( Cfa/Cwa ) with hot summers. At altitudes between 500 and 1,500 m (1,600 and 4,900 ft) located in
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#17331068822257564-554: The Erythraean Sea mentions a people called Sêsatai in the region, who produced malabathron (cinnamon-like aromatic leaves, dried and used as a flavouring agent), so prized in the old world. Ptolemy 's Geographia (2nd century CE) calls the region Kirrhadia , apparently after the Kirata population. In the early historical period (most of the first millennium CE), Kamarupa straddled most of present-day Northeast India. Xuanzang ,
7686-485: The French astronomer Delambre in the early 1800s which were repeated by R.R. Newton. Specifically, it proved Hipparchus was not the sole source of Ptolemy's catalog, as they both had claimed, and proved that Ptolemy did not simply copy Hipparchus' measurements and adjust them to account for precession of the equinoxes, as they had claimed. Scientists analyzing the charts concluded: It also confirms that Ptolemy’s Star Catalogue
7808-425: The Greek term Tetrabiblos (lit. "Four Books") or by its Latin equivalent Quadripartitum . Its original title is unknown, but may have been a term found in some Greek manuscripts, Apotelesmatiká ( biblía ), roughly meaning "(books) on the Effects" or "Outcomes", or "Prognostics". As a source of reference, the Tetrabiblos is said to have "enjoyed almost the authority of a Bible among the astrological writers of
7930-408: The Himalayan ranges in the northern border with India and China experience the lowest temperatures with heavy snow during winter and temperatures that drop below freezing. Areas with altitudes exceeding 2,000 metres (6,562 ft) receive snowfall during winters and have cool summers. Below 2,000 metres (6,562 ft) above sea level, winter temperatures reach up to 15 °C (59 °F) during
8052-414: The Imphal Valley; while "Naga" languages such as Poumai , Mao , Maram , Rongmei (Kabui), Tangkhul , Zeme , Liangmei , Inpui , Thangal Naga and Mizo languages such as Kuki/Thado , Lusei , Zomi languages (including Paite , Simte , Vaiphei , Zou , Mate , Thangkhal , Tedim-Chin ) , Gangte and Hmar languages (including Biete, Hrangkhawl, Thiek, Zote) predominate in individual hill areas of
8174-473: The Japanese to disrupt Allied supply lines to China and launch air attacks against India. However, the Allied forces, under the leadership of Field Marshal William Slim, held firm. They adopted aggressive tactics, including the creation of defensive "boxes" and the use of jungle warfare techniques. Despite being surrounded, the defenders at Kohima held out against intense Japanese attacks until reinforcements arrived. The battles of Imphal and Kohima resulted in
8296-444: The Macedonian family's rule. The name Claudius is a Roman name, belonging to the gens Claudia ; the peculiar multipart form of the whole name Claudius Ptolemaeus is a Roman custom, characteristic of Roman citizens. This indicates that Ptolemy would have been a Roman citizen . Gerald Toomer, the translator of Ptolemy's Almagest into English, suggests that citizenship was probably granted to one of Ptolemy's ancestors by either
8418-429: The Northeastern region of British India consisted of Assam and the princely states of Tripura Kingdom and Manipur Kingdom . Subsequently, Manipur and Tripura were made Union Territories of India in 1956 and in 1972 attained fully-fledged statehood. Later, Nagaland attained statehood in 1963, Meghalaya in 1972. Arunachal Pradesh and Mizoram became full-fledged states on 20 February 1987, being carved out of
8540-455: The Sun or Moon illusion (the enlarged apparent size on the horizon) based on the difficulty of looking upwards. The work is divided into three major sections. The first section (Book II) deals with direct vision from first principles and ends with a discussion of binocular vision. The second section (Books III-IV) treats reflection in plane, convex, concave, and compound mirrors. The last section (Book V) deals with refraction and includes
8662-422: The ability to make any predictions. The earliest person who attempted to merge these two approaches was Hipparchus , who produced geometric models that not only reflected the arrangement of the planets and stars but could be used to calculate celestial motions. Ptolemy, following Hipparchus, derived each of his geometrical models for the Sun, Moon, and the planets from selected astronomical observations done in
8784-625: The acting agency for the development of the north eastern states. Long after induction of NEC, Sikkim formed part of the North Eastern Region as the eighth state in 2002. India's Look-East connectivity projects connect Northeast India to East Asia and ASEAN . The city of Guwahati in Assam is referred to as the "Gateway to the Northeast" and is the largest metropolis in Northeast India. The earliest settlers may have been Austroasiatic speakers from Southeast Asia , followed by Tibeto-Burman speakers from China, and by 500 BCE Indo-Aryan speakers from
8906-520: The appearances and disappearances of stars over the course of the solar year. The Planisphaerium ( Greek : Ἅπλωσις ἐπιφανείας σφαίρας , lit. ' Flattening of the sphere ' ) contains 16 propositions dealing with the projection of the celestial circles onto a plane. The text is lost in Greek (except for a fragment) and survives in Arabic and Latin only. Ptolemy also erected an inscription in
9028-543: The arrival of monsoons and thus eastern areas have the highest temperatures in June and July where the monsoon arrives later than western areas. In the Cachar Plain, located south of the Brahmaputra plain, temperatures are higher than the Brahmaputra plain although the temperature range is smaller owing to higher cloud cover and the monsoons that moderate night temperatures year round. In the mountainous areas of Arunachal Pradesh,
9150-550: The biodiversity significance of the region: The International Council for Bird Preservation , UK identified the Assam plains and the Eastern Himalaya as an Endemic Bird Area (EBA). The EBA has an area of 220,000 km following the Himalayan range in the countries of Bangladesh, Bhutan, China, Nepal, Myanmar and the Indian states of Sikkim , North Bengal , Assam, Nagaland , Manipur , Meghalaya and Mizoram . Because of
9272-403: The book on astrology and attributed it to Ptolemy". Historical confusion on this point can be inferred from Abu Ma'shar's subsequent remark: "It is sometimes said that the very learned man who wrote the book of astrology also wrote the book of the Almagest . The correct answer is not known." Not much positive evidence is known on the subject of Ptolemy's ancestry, apart from what can be drawn from
9394-474: The capital of Meghalaya. Initially, the Japanese had invaded British territories in Southeast Asia, including Burma (now Myanmar), with the intention of creating a fortified perimeter around Japan. The British had neglected the defence of Burma, and by early 1942, the Japanese had captured Rangoon and pushed Allied forces back towards India through a gruelling retreat. In response to the Japanese advance,
9516-506: The data needed to compute the positions of the Sun, Moon and planets, the rising and setting of the stars, and eclipses of the Sun and Moon, making it a useful tool for astronomers and astrologers. The tables themselves are known through Theon of Alexandria 's version. Although Ptolemy's Handy Tables do not survive as such in Arabic or in Latin, they represent the prototype of most Arabic and Latin astronomical tables or zījes . Additionally,
9638-407: The day with nights dropping to zero while summers are cool, with a mean maximum of 25 °C (77 °F) and a mean minimum of 15 °C (59 °F). In the hilly areas of Meghalaya, Nagaland, Manipur and Mizoram, winters are cold while summers are cool. The plains in Manipur has colder winter minimums than what is warranted by its elevation owing to being surrounded by hills on all sides. This
9760-734: The details of his name, although modern scholars have concluded that Abu Ma'shar's account is erroneous. It is no longer doubted that the astronomer who wrote the Almagest also wrote the Tetrabiblos as its astrological counterpart. In later Arabic sources, he was often known as "the Upper Egyptian ", suggesting he may have had origins in southern Egypt . Arabic astronomers , geographers , and physicists referred to his name in Arabic as Baṭlumyus ( Arabic : بَطْلُمْيوس ). Ptolemy wrote in Koine Greek , and can be shown to have used Babylonian astronomical data . He might have been
9882-402: The earliest surviving table of refraction from air to water, for which the values (with the exception of the 60° angle of incidence) show signs of being obtained from an arithmetic progression. However, according to Mark Smith, Ptolemy's table was based in part on real experiments. Ptolemy's theory of vision consisted of rays (or flux) coming from the eye forming a cone, the vertex being within
10004-483: The eastern hills of Nagaland, Manipur and Arunachal Pradesh, a ( Cfb/CWb ) climate prevails with warm summers. Locations above 1,500 m (4,900 ft) in Meghalaya, parts of Nagaland, and northern Arunachal Pradesh have a ( Cfc/Cwc ) climate with short and cool summers. Finally, the extreme northern parts of Arunachal Pradesh are classified as humid continental climates with mean winter temperatures below −3 °C (27 °F). Temperatures vary by altitude with
10126-567: The ecosystem, high seismic activity, and floods. The states of Arunachal Pradesh and Sikkim have a montane climate with cold, snowy winters and mild summers. Kangchenjunga , the third highest mountain peak in the world rising to an altitude of 8,586 m (28,169 ft), lies in-between the state Sikkim and adjacent country Nepal . Tributaries of the Brahmaputra River in Northeast India: Northeast India has
10248-469: The elevation of the north celestial pole for a few cities. Although maps based on scientific principles had been made since the time of Eratosthenes ( c. 276 – c. 195 BC ), Ptolemy improved on map projections . The first part of the Geography is a discussion of the data and of the methods he used. Ptolemy notes the supremacy of astronomical data over land measurements or travelers' reports, though he possessed these data for only
10370-543: The emperor Claudius or the emperor Nero . The 9th century Persian astronomer Abu Ma'shar al-Balkhi mistakenly presents Ptolemy as a member of Ptolemaic Egypt's royal lineage , stating that the descendants of the Alexandrine general and Pharaoh Ptolemy I Soter were wise "and included Ptolemy the Wise, who composed the book of the Almagest ". Abu Ma'shar recorded a belief that a different member of this royal line "composed
10492-425: The empirical musical relations he identified by testing pitches against each other: He was able to accurately measure relative pitches based on the ratios of vibrating lengths two separate sides of the same single string , hence which were assured to be under equal tension, eliminating one source of error. He analyzed the empirically determined ratios of "pleasant" pairs of pitches, and then synthesised all of them into
10614-419: The eye, and the base defining the visual field. The rays were sensitive, and conveyed information back to the observer's intellect about the distance and orientation of surfaces. Size and shape were determined by the visual angle subtended at the eye combined with perceived distance and orientation. This was one of the early statements of size-distance invariance as a cause of perceptual size and shape constancy,
10736-516: The great Hindu epic Mahabharata . The Saptakanda Ramayana in Assamese by Madhava Kandali is considered the first translation of the Sanskrit Ramayana into a modern Indo-Aryan Language . Karbi Ramayana bears witness to the old heritage of written literature in Assam. Two writers from the Northeast, viz., Birendra Kumar Bhattacharya and Mamoni Raisom Goswami , have been awarded Jnanpith ,
10858-542: The highest literary award in India. Hence, Birendra Kumar Bhattacharya was the first Assamese writer and from the Northeast India to receive Jnanpith Award for his Assamese novel Mrityunjay (1979). Mamoni Raisom Goswami was awarded the Jnanpith Award in the year 2000. Nagen Saikia is the first writer from Assam and the Northeast India, to have been conferred the Sahitya Akademi Fellowship by
10980-643: The hilly areas. At the highest altitudes, there is permanent snow cover. In general, the region has 3 seasons: Winter, Summer, and rainy season in which the rainy season coincides with the summer months much like the rest of India. Winter is from early November until mid March while summer is from mid-April to mid-October. Under the Köppen climate classification , the region is divided into 3 broad types: A (tropical climates), C (warm temperate mesothermal climates), and D (snow microthermal climates). The tropical climates are located in parts of Manipur, Tripura, Mizoram, and
11102-553: The history of science". One striking error noted by Newton was an autumn equinox said to have been observed by Ptolemy and "measured with the greatest care" at 2pm on 25 September 132, when the equinox should have been observed around 9:55am the day prior. In attempting to disprove Newton, Herbert Lewis also found himself agreeing that "Ptolemy was an outrageous fraud," and that "all those result capable of statistical analysis point beyond question towards fraud and against accidental error". The charges laid by Newton and others have been
11224-599: The introduction to the Handy Tables survived separately from the tables themselves (apparently part of a gathering of some of Ptolemy's shorter writings) under the title Arrangement and Calculation of the Handy Tables . The Planetary Hypotheses ( Greek : Ὑποθέσεις τῶν πλανωμένων , lit. ' Hypotheses of the Planets ' ) is a cosmological work, probably one of the last written by Ptolemy, in two books dealing with
11346-405: The large territory of Assam. Sikkim was integrated as the eighth North Eastern Council state in 2002. The city of Shillong served as the capital of the Assam province created during British Rule. It remained the capital of undivided Assam until the formation of the state of Meghalaya in 1972. The capital of Assam was shifted to Dispur , a part of Guwahati , and Shillong was designated as
11468-485: The local market for fuel at a price of 8,000 rupees per tonne. On 14 December 2020, a blast occurred at 8:40 p.m., in which two people were injured. In January 2021, it expanded its business to East India by opening a new plant in West Bengal worth 4.5 billion. In August 2021, the company approves a share buyback proposal. In June 2022, the company invested 17–18 billion rupees in doubling the capacity of clinker and adding
11590-500: The mathematics of music should be based on only the one specific ratio of 3:2, the perfect fifth , and believed that tunings mathematically exact to their system would prove to be melodious, if only the extremely large numbers involved could be calculated (by hand). To the contrary, Ptolemy believed that musical scales and tunings should in general involve multiple different ratios arranged to fit together evenly into smaller tetrachords (combinations of four pitch ratios which together make
11712-555: The modern title is thought to be an Arabic corruption of the Greek name Hē Megistē Syntaxis (lit. "The greatest treatise"), as the work was presumably known in Late Antiquity . Because of its reputation, it was widely sought and translated twice into Latin in the 12th century , once in Sicily and again in Spain. Ptolemy's planetary models, like those of the majority of his predecessors, were geocentric and almost universally accepted until
11834-477: The motions of the Sun, Moon, planets, and stars. In 2023, archaeologists were able to read a manuscript which gives instructions for the construction of an astronomical tool called a meteoroscope ( μετεωροσκόπιον or μετεωροσκοπεῖον ). The text, which comes from an eighth-century manuscript which also contains Ptolemy's Analemma , was identified on the basis of both its content and linguistic analysis as being by Ptolemy. Ptolemy's second most well-known work
11956-461: The observations were taken at 12:30pm. The overall quality of Ptolemy's observations has been challenged by several modern scientists, but prominently by Robert R. Newton in his 1977 book The Crime of Claudius Ptolemy , which asserted that Ptolemy fabricated many of his observations to fit his theories. Newton accused Ptolemy of systematically inventing data or doctoring the data of earlier astronomers, and labelled him "the most successful fraud in
12078-401: The radius of the sphere of the fixed stars was 20 000 times the radius of the Earth. The work is also notable for having descriptions on how to build instruments to depict the planets and their movements from a geocentric perspective, much as an orrery would have done for a heliocentric one, presumably for didactic purposes. The Analemma is a short treatise where Ptolemy provides
12200-486: The reappearance of heliocentric models during the scientific revolution . Under the scrutiny of modern scholarship, and the cross-checking of observations contained in the Almagest against figures produced through backwards extrapolation, various patterns of errors have emerged within the work. A prominent miscalculation is Ptolemy's use of measurements that he claimed were taken at noon, but which systematically produce readings now shown to be off by half an hour, as if
12322-442: The region is rich with the practice of hunting, land cultivation and indigenous crafts. The rich culture is vibrant and visible with the traditional attires of each community. All states in Northeast India share the handicrafts of bamboo and cane , wood carving , making traditional weapons and musical instruments, pottery and handloom weaving. Traditional tribal attires are made of thick fabrics primarily with cotton. Assam silk
12444-525: The region like Arunachal Pradesh , Meghalaya , Mizoram , and Nagaland are predominantly inhabited by tribal people with a degree of diversity even within the tribal groups. The region's population results from ancient and continuous flows of migrations from Tibet, Indo-Gangetic India, the Himalayas, present Bangladesh, and Myanmar. These ethnic groups form significant majorities in the states/regions of Northeast India: These ethnic groups form minorities in
12566-410: The region, the average date of onset of the monsoons is 1 June. Southern areas are the first to receive the monsoon (May or June) with the Brahmaputra valley and the mountainous north receiving later (later May or June). In the hilly parts of Mizoram, the closer proximity to the Bay of Bengal causes it to experience early monsoons with June being the wettest season. The North Eastern Region of India
12688-536: The remaining three are present in other endemic and secondary areas. Eleven of the 22 restricted-range species found in this region are considered as threatened ( Birdlife International 2001), a number greater than in any other EBA of India. Northeast India is very rich in faunal diversity . There are as many as 15 species of non-human primates and most important of them are hoolock gibbon , stumptied macaque , pigtailed macaque, golden langur, hanuman langur and rhesus monkey. The most important and endangered species
12810-538: The scene in the guise of saviours. In the early 19th century, both the Ahom and the Manipur kingdoms fell to a Burmese invasion . The ensuing First Anglo-Burmese War resulted in the entire region coming under British control. In the colonial period (1826–1947), North East India was made a part of Bengal Province from 1839 to 1873, after which Colonial Assam became its own province , but which included Sylhet . After Indian Independence from British Rule in 1947,
12932-405: The secondary literature, while noting that issues with the accuracy of Ptolemy's observations had long been known. Other authors have pointed out that instrument warping or atmospheric refraction may also explain some of Ptolemy's observations at a wrong time. In 2022 the first Greek fragments of Hipparchus' lost star catalog were discovered in a palimpsest and they debunked accusations made by
13054-516: The south-west, 97 kilometres (60 mi) with Nepal in the west, and 455 kilometres (283 mi) with Bhutan in the north-west. It comprises an area of 262,184 square kilometres (101,230 sq mi), almost 8 per cent of that of India. The Siliguri Corridor connects the region to the rest of mainland India . The states of North Eastern Region are officially recognised under the North Eastern Council (NEC), constituted in 1971 as
13176-474: The spanning of more than 800 years; however, many astronomers have for centuries suspected that some of his models' parameters were adopted independently of observations. Ptolemy presented his astronomical models alongside convenient tables, which could be used to compute the future or past position of the planets. The Almagest also contains a star catalogue , which is a version of a catalogue created by Hipparchus . Its list of forty-eight constellations
13298-451: The spheres ). Although Ptolemy's Harmonics never had the influence of his Almagest or Geography , it is nonetheless a well-structured treatise and contains more methodological reflections than any other of his writings. In particular, it is a nascent form of what in the following millennium developed into the scientific method, with specific descriptions of the experimental apparatus that he built and used to test musical conjectures, and
13420-542: The state. Main languages of North East India Among other Indo-Aryan languages, Chakma is spoken in Mizoram and Hajong in Assam and Meghalaya. Nepali , an Indo-Aryan language, is dominant in Sikkim , besides the Sino-Tibetan languages Limbu , Bhutia , Lepcha , Rai , Tamang , Sherpa , etc. Bengali was made the official language of Colonial Assam from 1836 to 1873. Religion in Northeast India (2011) Hinduism
13542-598: The states of Northeast India: The Manipuri Raas Leela dance (from Manipur ) and the Sattriya (from Assam ) have been included in the elite category of the " Classical Dances of India ", as officially recognised by both the Sangeet Natak Akademi and the Ministry of Culture (India) . Besides these, all tribes in Northeast India have their own folk dances associated with their religion and festivals. The tribal heritage in
13664-529: The states of the region, higher than the national average at 17.64 per cent; while Nagaland recorded the lowest in the entire country with a negative 0.5 per cent. According to 2011 Census of India , the largest cities in Northeast India are UA: Urban Agglomeration Northeast India constitutes a single linguistic region within the Indian national context, with about 220 languages in multiple language families ( Indo-European , Sino-Tibetan , Kra–Dai , Austroasiatic , as well as some creole languages) that share
13786-440: The structure of the universe and the laws that govern celestial motion . Ptolemy goes beyond the mathematical models of the Almagest to present a physical realization of the universe as a set of nested spheres, in which he used the epicycles of his planetary model to compute the dimensions of the universe. He estimated the Sun was at an average distance of 1 210 Earth radii (now known to actually be ~23 450 radii), while
13908-517: The subject of wide discussions and received significant push back from other scholars against the findings. Owen Gingerich , while agreeing that the Almagest contains "some remarkably fishy numbers", including in the matter of the 30-hour displaced equinox, which he noted aligned perfectly with predictions made by Hipparchus 278 years earlier, rejected the qualification of fraud. Objections were also raised by Bernard Goldstein , who questioned Newton's findings and suggested that he had misunderstood
14030-496: The supremacy of mathematical knowledge over other forms of knowledge. Like Aristotle before him, Ptolemy classifies mathematics as a type of theoretical philosophy; however, Ptolemy believes mathematics to be superior to theology or metaphysics because the latter are conjectural while only the former can secure certain knowledge. This view is contrary to the Platonic and Aristotelian traditions, where theology or metaphysics occupied
14152-573: The third part of the Geography , Ptolemy gives instructions on how to create maps both of the whole inhabited world ( oikoumenē ) and of the Roman provinces, including the necessary topographic lists, and captions for the maps. His oikoumenē spanned 180 degrees of longitude from the Blessed Islands in the Atlantic Ocean to the middle of China , and about 80 degrees of latitude from Shetland to anti-Meroe (east coast of Africa ); Ptolemy
14274-479: The warmest places being in the Brahmaputra and Barak River plains and the coldest at the highest altitudes. It is also influenced by proximity to the sea with the valleys and western areas being close to the sea, which moderates temperatures. Generally, temperatures in the hilly and mountainous areas are lower than the plains which lie at a lower altitude. Summer temperatures tend to be more uniform than winter temperatures due to high cloud cover and humidity. In
14396-461: Was Ptolemais Hermiou , a Greek city in the Thebaid region of Egypt (now El Mansha, Sohag Governorate ). This attestation is quite late, however, and there is no evidence to support it. It is known that Ptolemy lived in or around the city of Alexandria , in the Roman province of Egypt under Roman rule . He had a Latin name, Claudius, which is generally taken to imply he was a Roman citizen . He
14518-431: Was an Alexandrian mathematician , astronomer , astrologer , geographer , and music theorist who wrote about a dozen scientific treatises , three of which were important to later Byzantine , Islamic , and Western European science. The first was his astronomical treatise now known as the Almagest , originally entitled Mathematical Treatise ( Greek : Μαθηματικὴ Σύνταξις , Mathēmatikḗ Syntaxis ). The second
14640-614: Was familiar with Greek philosophers and used Babylonian observations and Babylonian lunar theory. In half of his extant works, Ptolemy addresses a certain Syrus, a figure of whom almost nothing is known but who likely shared some of Ptolemy's astronomical interests. Ptolemy died in Alexandria c. 168 . Ptolemy's Greek name , Ptolemaeus ( Πτολεμαῖος , Ptolemaîos ), is an ancient Greek personal name . It occurs once in Greek mythology and
14762-464: Was not based solely on data from Hipparchus’ Catalogue. ... These observations are consistent with the view that Ptolemy composed his star catalogue by combining various sources, including Hipparchus’ catalogue, his own observations and, possibly, those of other authors. The Handy Tables ( Greek : Πρόχειροι κανόνες ) are a set of astronomical tables, together with canons for their use. To facilitate astronomical calculations, Ptolemy tabulated all
14884-499: Was well aware that he knew about only a quarter of the globe, and an erroneous extension of China southward suggests his sources did not reach all the way to the Pacific Ocean. It seems likely that the topographical tables in the second part of the work (Books 2–7) are cumulative texts, which were altered as new knowledge became available in the centuries after Ptolemy. This means that information contained in different parts of
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