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121-481: Agathemerus's work consists chiefly of extracts from Ptolemy , Artemidorus Ephesius and other earlier writers. In his work, he gives a short account of the various forms assigned to the Earth by previous geographers . He calculated the distances between land masses and seas, and then laid down important distances on the inhabited part of the Earth using the stadiametric method . This Ancient Greek biographical article

242-422: A Hippodamian grid plan . Following Alexander's death in 323 BC, his general Ptolemy Lagides took possession of Egypt and brought Alexander's body to Egypt with him. Ptolemy at first ruled from the old Egyptian capital of Memphis . In 322/321 BC he had Cleomenes executed. Finally, in 305 BC, Ptolemy declared himself Pharaoh as Ptolemy I Soter ("Savior") and moved his capital to Alexandria. Although Cleomenes

363-458: A Roman triumphal column , is one of the best-known ancient monuments still standing in Alexandria today. It is located on Alexandria's ancient acropolis —a modest hill located adjacent to the city's Arab cemetery —and was originally part of a temple colonnade. Including its pedestal , it is 30 m (99 ft) high; the shaft is of polished red granite, 2.7 m (8.9 ft) in diameter at

484-575: A hot steppe climate (Köppen climate classification: BSh ), virtually hot desert climate ( Köppen climate classification : BWh ). Like the rest of Egypt's northern coast , the prevailing north wind, blowing across the Mediterranean, gives the city a less severe climate than the desert hinterland. Rafah and Alexandria are the wettest places in Egypt; the other wettest places are Rosetta , Baltim , Kafr el-Dawwar , and Mersa Matruh . The city's climate

605-417: 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

726-402: A Greek unit of length measuring approximately 180 m or 590 ft). The end of this abutted on the land at the head of the present Grand Square, where the "Moon Gate" rose. All that now lies between that point and the modern "Ras al-Tin" quarter is built on the silt which gradually widened and obliterated this mole. The Ras al-Tin quarter represents all that is left of the island of Pharos,

847-541: A Nile river delta, Alexandria is one of the most vulnerable cities to sea level rise in the entire world. According to some estimates, hundreds of thousands of people in its low-lying areas may already have to be relocated before 2030. The 2022 IPCC Sixth Assessment Report estimates that by 2050, Alexandria and 11 other major African cities ( Abidjan , Algiers , Cape Town , Casablanca , Dakar , Dar es Salaam , Durban , Lagos , Lomé , Luanda and Maputo ) would collectively sustain cumulative damages of US$ 65 billion for

968-645: A Ptolemaic colonnade and streets in the north-east of the city, but little else. Hogarth explored part of an immense brick structure under the mound of Kom El Deka , which may have been part of the Paneum, the Mausolea, or a Roman fortress. The making of the new foreshore led to the dredging up of remains of the Patriarchal Church; and the foundations of modern buildings are seldom laid without some objects of antiquity being discovered. The most famous mosque in Alexandria

1089-601: 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

1210-522: A bishop decreed that Paganism must be eradicated. Beneath the acropolis itself are the subterranean remains of the Serapeum, where the mysteries of the god Serapis were enacted and whose carved wall niches are believed to have provided overflow storage space for the ancient Library. In more recent years, many ancient artifacts have been discovered from the surrounding sea, mostly pieces of old pottery. Alexandria's catacombs , known as Kom El Shoqafa , are

1331-470: 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

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1452-402: 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

1573-492: 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

1694-587: 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

1815-461: 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

1936-461: A seawall, quays and a bridge. Near the beach side of the area, there are the remains of a tower built by Ptolemy II Philadelphus. The tower was an exact scale replica of the destroyed Alexandrine Pharos Lighthouse . Citadel of Qaitbay is a defensive fortress located on the Mediterranean sea coast. It was established in 1477 AD (882 AH ) by the mamluk Sultan Al-Ashraf Sayf al-Din Qa'it Bay . The Citadel

2057-429: A short distance southwest of the pillar, consist of a multi-level labyrinth, reached via a large spiral staircase and featuring dozens of chambers adorned with sculpted pillars, statues, and other syncretic Romano-Egyptian religious symbols , burial niches, and sarcophagi , as well as a large Roman-style banquet room, where memorial meals were conducted by relatives of the deceased. The catacombs were long forgotten by

2178-415: A successful attempt to erect a 25-ton obelisk in 1999. This followed two experiments to erect smaller obelisks and two failed attempts to erect a 25-ton obelisk. "Pompey's Pillar" is a misnomer , as it has nothing to do with Pompey , having been erected in 293 for Diocletian , possibly in memory of the rebellion of Domitius Domitianus . The structure was plundered and demolished in the 4th century when

2299-543: 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

2420-478: 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

2541-553: 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.,

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2662-498: Is a stub . You can help Misplaced Pages by expanding it . This article about a Greek scientist is a stub . You can help Misplaced Pages by expanding it . This biographical article about a geographer is a stub . You can help Misplaced Pages by expanding it . Ptolemy This is an accepted version of this page Claudius Ptolemy ( / ˈ t ɒ l ə m i / ; Ancient Greek : Πτολεμαῖος , Ptolemaios ; Latin : Claudius Ptolemaeus ; c.  100  – c.  170 AD)

2783-542: Is a popular tourist destination and an important industrial centre due to its natural gas and oil pipelines from Suez . The city extends about 40 km (25 mi) along the northern coast of Egypt and is the largest city on the Mediterranean, the second-largest in Egypt (after Cairo ), the fourth-largest city in the Arab world , the ninth-largest city in Africa , and the ninth-largest urban area in Africa . The city

2904-572: 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;

3025-475: Is built up') existed since the 13th century BC in the vicinity and eventually grew into the Egyptian quarter of the city. Just east of Alexandria (where Abu Qir Bay is now), there were in ancient times marshland and several islands. As early as the 7th century BC, there existed important port cities of Canopus and Heracleion . The latter was recently rediscovered underwater. Alexandria was founded by Alexander

3146-624: 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

3267-589: Is in the Far West Nile delta area. It is a densely populated city; its core areas belie its large administrative area. Notes: 2020 CAPMAS projection based on 2017 revised census figures, may differ significantly from 2017 census preliminary tabulations. The 14 kisms were reported simply as Alexandria city by CAPMAS in 2006 but given explosive growth definitions, likely informal, may have changed or may be set to change. Same area with 12 kisms existed in 1996. Kisms are considered 'fully urbanised' Alexandria has

3388-537: Is influenced by the Mediterranean Sea , moderating its temperatures, causing variable rainy winters and moderately hot and slightly prolonged summers that, at times, can be very humid; January and February are the coolest months, with daily maximum temperatures typically ranging from 12 to 18 °C (54 to 64 °F) and minimum temperatures that could reach 5 °C (41  °F ). Alexandria experiences violent storms , rain and sometimes sleet and hail during

3509-579: Is located on the eastern side of the northern tip of Pharos Island at the mouth of the Eastern Harbour . It was erected on the exact site of the famous Lighthouse of Alexandria , which was one of the Seven Wonders of the Ancient World . It was built on an area of 17,550 square metres . Persistent efforts have been made to explore the antiquities of Alexandria. Encouragement and help have been given by

3630-578: 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

3751-622: 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

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3872-536: Is the second largest city in Egypt and the largest city on the Mediterranean coast . It lies at the western edge of the Nile River delta . Founded in c.  331 BC by Alexander the Great , Alexandria grew rapidly and became a major centre of Hellenic civilisation , eventually replacing Memphis , in present-day Greater Cairo , as Egypt's capital. Called the "Bride of the Mediterranean" internationally, Alexandria

3993-462: 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

4114-562: 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

4235-662: 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

4356-637: The Battle of Ridaniya in 1517, the city was conquered by the Ottoman Turks and remained under Ottoman rule until 1798. Alexandria lost much of its former importance to the Egyptian port city of Rosetta during the 9th to 18th centuries, and it only regained its former prominence with the construction of the Mahmoudiyah Canal in 1820. Alexandria figured prominently in the military operations of Napoleon 's expedition to Egypt in 1798. French troops stormed

4477-553: The Coptic Orthodox Church and the Greek Orthodox Church of Alexandria both lay claim to this ancient heritage. By 641, the city had already been largely plundered and lost its significance before re-emerging in the modern era. From the late 18th century, Alexandria became a major centre of the international shipping industry and one of the most important trading centres in the world, both because it profited from

4598-410: 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

4719-645: 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

4840-586: The Muslim conquest of Egypt in 641 AD, when a new capital was founded at Fustat (later absorbed into Cairo ). Alexandria was best known for the Lighthouse of Alexandria ( Pharos ), one of the Seven Wonders of the Ancient World ; its Great Library , the largest in the ancient world; and the Catacombs of Kom El Shoqafa , one of the Seven Wonders of the Middle Ages . Alexandria was the intellectual and cultural centre of

4961-784: 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

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5082-457: 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

5203-461: 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

5324-519: 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

5445-430: 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

5566-464: The "moderate" climate change scenario RCP 4.5 and US$ 86.5 billion for the high-emission scenario RCP 8.5, while RCP 8.5 combined with the hypothetical impact from marine ice sheet instability at high levels of warming would involve up to US$ 137.5 billion in damages. Additional accounting for the "low-probability, high-damage events" may increase aggregate risks to US$ 187 billion for the "moderate" RCP4.5, US$ 206 billion for RCP8.5 and US$ 397 billion under

5687-524: The 4th century AD. This underwater section, containing many of the most interesting sections of the Hellenistic city, including the palace quarter, was explored in 1992 and is still being extensively investigated by the French underwater archaeologist Franck Goddio and his team . It raised a noted head of Caesarion . These are being opened up to tourists, to some controversy. The spaces that are most open are

5808-467: The Arabs under the general 'Amr ibn al-'As invaded it during the Muslim conquest of Egypt , after a siege that lasted 14 months. The first Arab governor of Egypt recorded to have visited Alexandria was Utba ibn Abi Sufyan , who strengthened the Arab presence and built a governor's palace in the city in 664–665. In reference to Alexandria, Ibn Battuta speaks of a number of Muslim saints that resided in

5929-436: 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

6050-576: The Great in April 331 BC as Ἀλεξάνδρεια ( Alexandreia ), as one of his many city foundations . After he captured the Egyptian Satrapy from the Persians , Alexander wanted to build a large Greek city on Egypt's coast that would bear his name. He chose the site of Alexandria, envisioning the building of a causeway to the nearby island of Pharos that would generate two great natural harbours. Alexandria

6171-504: The Great Harbour. The names of a few other public buildings on the mainland are known, but there is little information as to their actual position. None, however, are as famous as the building that stood on the eastern point of Pharos island. There, The Great Lighthouse , one of the Seven Wonders of the World , reputed to be 138 m (453 ft) high, was situated. The first Ptolemy began

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6292-473: 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

6413-497: 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

6534-507: The Rosetta Gate, but remnants of streets and canals were exposed in 1899 by German excavators outside the east fortifications, which lie well within the area of the ancient city. Alexandria consisted originally of little more than the island of Pharos, which was joined to the mainland by a 1,260 m-long (4,130 ft) mole and called the Heptastadion ("seven stadia"—a stadium was

6655-585: The Serapeum. Nearby, immense catacombs and columbaria have been opened which may have been appendages of the temple. These contain one very remarkable vault with curious painted reliefs, now artificially lit and open to visitors. The objects found in these researches are in the museum, the most notable being a great basalt bull, probably once an object of cult in the Serapeum. Other catacombs and tombs have been opened in Kom El Shoqafa (Roman) and Ras El Tin (painted). The German excavation team found remains of

6776-710: The Society for the Promotion of Hellenic Studies in 1895; and a German expedition worked for two years (1898–1899). But two difficulties face the would-be excavator in Alexandria: lack of space for excavation and the underwater location of some areas of interest. Since the great and growing modern city stands immediately over the ancient one, it is almost impossible to find any considerable space in which to dig, except at enormous cost. Cleopatra VII 's royal quarters were inundated by earthquakes and tsunami, leading to gradual subsidence in

6897-590: The Sultan of Egypt at the time, al-Nasir Muhammad . Ibn Battuta also visited the Pharos lighthouse on two occasions: in 1326 he found it to be partly in ruins and in 1349 it had deteriorated to the point that it was no longer possible to enter. During the Middle Ages , the Mamluk Sultanate provided amenities for European merchants to stay in the port cities of Alexandria and Damietta , so hotels were built and placed at

7018-455: 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

7139-422: 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

7260-568: The ancient Mediterranean for much of the Hellenistic age and late antiquity . It was at one time the largest city in the ancient world before being eventually overtaken by Rome . The city was a major centre of early Christianity and was the centre of the Patriarchate of Alexandria , which was one of the major centres of Christianity in the Eastern Roman Empire . In the modern world,

7381-472: 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

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7502-513: The base, tapering to 2.4 m (7.9 ft) at the top. The shaft is 88 ft (27 m) high and made out of a single piece of granite. Its volume is 132 m (4,662 cu ft) and weight approximately 396 tons. Pompey's Pillar may have been erected using the same methods that were used to erect the ancient obelisks . The Romans had cranes but they were not strong enough to lift something this heavy. Roger Hopkins and Mark Lehrner conducted several obelisk erecting experiments including

7623-403: 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

7744-458: The centre of the city, close to the point where the Sema (or Soma) of Alexander (his Mausoleum ) rose. This point is very near the present mosque of Nebi Daniel ; the line of the great East–West "Canopic" street is also present in modern-day Alexandria, having only slightly diverged from the line of the modern Boulevard de Rosette (now Sharae Fouad). Traces of its pavement and canal have been found near

7865-507: The citizens until they were discovered by accident in 1900. The most extensive ancient excavation currently being conducted in Alexandria is known as Kom El Deka . It has revealed the ancient city's well-preserved theater, and the remains of its Roman-era baths . The temple was built in the Ptolemy era and dedicated to Osiris, which finished the construction of Alexandria. It is located in Abusir,

7986-565: The city on 2 July 1798, and it remained in their hands until the arrival of a British expedition in 1801. The British won a considerable victory over the French at the Battle of Alexandria on 21 March 1801, following which they besieged the city , which fell to them on 2 September 1801. Muhammad Ali , the Ottoman governor of Egypt, began rebuilding and redevelopment around 1810 and, by 1850, Alexandria had returned to something akin to its former glory. Egypt turned to Europe in their effort to modernise

8107-513: The city. One such saint was Imam Borhan Oddin El Aaraj, who was said to perform miracles. Another notable figure was Yaqut al-'Arshi, a disciple of Abu Abbas El Mursi . Ibn Battuta also writes about Abu 'Abdallah al-Murshidi, a saint that lived in the Minyat of Ibn Murshed. Although al-Murshidi lived in seclusion, Ibn Battuta writes that he was regularly visited by crowds, high state officials, and even by

8228-471: The climate of Alexandria in the year 2050 would most closely resemble the current climate of Gaza City . The annual temperature would increase by 2.8 °C (5.0 °F), and the temperature of the warmest and the coldest month by 2.9 °C (5.2 °F) and 3.1 °C (5.6 °F). According to Climate Action Tracker , the current warming trajectory appears consistent with 2.7 °C (4.9 °F), which closely matches RCP 4.5. Due to its location on

8349-493: The cooler months; these events, combined with a poor drainage system, have been responsible for occasional flooding in the city in the past though they rarely occur anymore. July and August are the hottest and driest months of the year, with an average daily maximum temperature of 30 °C (86  °F ). The average annual rainfall is around 211 mm (8.3 in) but has been as high as 417 mm (16.4 in) Port Said , Kosseir , Baltim , Damietta and Alexandria have

8470-475: The country. Greeks, followed by other Europeans and others, began moving to the city. In the early 20th century, the city became a home for novelists and poets. In July 1882, the city came under bombardment from British naval forces and was occupied. In July 1954, the city was a target of an Israeli bombing campaign that later became known as the Lavon Affair . On 26 October 1954, Alexandria's Mansheya Square

8591-587: The course of Roman rule in Egypt , the city's name was Latinised as Alexandrēa ad Aegyptum . After the capture of Alexandria by the Rashiduns in AD 641, the name was Arabicised : initial Al- was re-analysed into the definite article ; metathesis occurred on x , from [ks] to [sk] ; and the suffix -eia was assimilated into the feminine adjectival suffix -iyya ( ـِيَّة ). Radiocarbon dating of seashell fragments and lead contamination show human activity at

8712-506: 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,

8833-734: 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

8954-402: The distinction of its population's three largest ethnicities: Greek, Egyptian and Jewish. By the time of Augustus , the city grid encompassed an area of 10 km (3.9 sq mi), and the total population during the Roman principate was around 500,000–600,000, which would wax and wane in the course of the next four centuries under Roman rule. According to Philo of Alexandria , in

9075-402: 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

9196-513: The easy overland connection between the Mediterranean and Red Seas and the lucrative trade in Egyptian cotton . Alexandria was located on the earlier Egyptian settlement, which was called Rhacotis ( Ancient Greek : Ῥακῶτις , romanized :  Rhakôtis ), the Hellenised form of Egyptian r-ꜥ-qd(y)t . As one of many settlements founded by Alexander the Great, the city he founded on Rhacotis

9317-469: 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

9438-543: 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

9559-425: 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

9680-419: 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,

9801-488: The high-end ice sheet instability scenario. In every single estimate, Alexandria alone bears around half of these costs. Since sea level rise would continue for about 10,000 years under every scenario of climate change, future costs of sea level rise would only increase, especially without adaptation measures. Greek Alexandria was divided into three regions: Two main streets, lined with colonnades and said to have been each about 60 m (200 ft) wide, intersected in

9922-472: The highest honour. Despite being a minority position among ancient philosophers, Ptolemy's views were shared by other mathematicians such as Hero of Alexandria . There are several characters and items named after Ptolemy, including: Alexandria Alexandria ( / ˌ æ l ɪ ɡ ˈ z æ n d r i ə , - ˈ z ɑː n -/ AL -ig- ZA(H)N -dree-ə ; Arabic : الإسكندرية ; Ancient Greek : Ἀλεξάνδρεια , Coptic : Ⲣⲁⲕⲟϯ - Rakoti or ⲁⲗⲉⲝⲁⲛⲇⲣⲓⲁ)

10043-553: 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

10164-599: 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

10285-470: The largest cities ever built before the Industrial Revolution and the largest pre-industrial city that was not an imperial capital. Due to the constant presence of war in Alexandria in ancient times, very little of the ancient city has survived into the present day. Much of the royal and civic quarters sank beneath the harbour and the rest has been built over in modern times. " Pompey's Pillar ",

10406-545: The largest city in the world and, for some centuries more, was second only to Rome. It became Egypt's main Greek city, with Greek people from diverse backgrounds. The Septuagint , a Greek version of the Tanakh , was produced there. The early Ptolemies kept it in order and fostered the development of its museum into the leading Hellenistic centre of learning ( Library of Alexandria , which faced destruction during Caesar 's siege of Alexandria in 47 BC), but were careful to maintain

10527-477: The least temperature variation in Egypt. The highest recorded temperature was 45 °C (113 °F) on 30 May 1961, and the coldest recorded temperature was 0 °C (32 °F) on 31 January 1994. A 2019 paper published in PLOS One estimated that under Representative Concentration Pathway 4.5 , a "moderate" scenario of climate change where global warming reaches ~2.5–3 °C (4.5–5.4 °F) by 2100,

10648-468: The local Archaeological Society and by many individuals. Excavations were performed in the city by Greeks seeking the tomb of Alexander the Great without success. The past and present directors of the museum have been enabled from time to time to carry out systematic excavations whenever opportunity is offered; D. G. Hogarth made tentative researches on behalf of the Egypt Exploration Fund and

10769-510: The location during the period of the Old Kingdom (27th–21st centuries BC) and again in the period 1000–800 BC, followed by the absence of activity after that. From ancient sources it is known there existed a trading post at this location during the time of Rameses the Great for trade with Crete , but it had long been lost by the time of Alexander's arrival. A small Egyptian fishing village named Rhakotis ( Egyptian : rꜥ-qdy.t , 'That which

10890-399: The low grounds to northeast and southwest, where it is practically impossible to get below the Roman strata . The most important results were those achieved by Dr. G. Botti, late director of the museum, in the neighbourhood of "Pompey's Pillar", where there is a good deal of open ground. Here, substructures of a large building or group of buildings have been exposed, which are perhaps part of

11011-500: 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

11132-515: The merchants' disposal so that they could live according to the pattern they were accustomed to in their country. Alexandria lost much of its importance in international trade after Portuguese navigators discovered a new sea route to India in the late 15th century. This reduced the amount of goods that needed to be transported through the Alexandrian port, as well as the Mamluks' political power. After

11253-555: 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

11374-477: 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

11495-461: 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

11616-414: The project, and the second Ptolemy ( Ptolemy II Philadelphus ) completed it, at a total cost of 800  talents . It took 12 years to complete and served as a prototype for all later lighthouses in the world. The light was produced by a furnace at the top and the tower was built mostly with solid blocks of limestone. The Pharos lighthouse was destroyed by an earthquake in the 14th century, making it

11737-401: 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

11858-486: 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

11979-496: The second longest surviving ancient wonder, after the Great Pyramid of Giza . A temple of Hephaestus also stood on Pharos at the head of the mole. In the 1st century, the population of Alexandria contained over 180,000 adult male citizens, according to a census dated from 32 AD, in addition to a large number of freedmen, women, children and slaves. Estimates of the total population range from 216,000 to 500,000, making it one of

12100-405: 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

12221-457: The site of the actual lighthouse having been weathered away by the sea. On the east of the mole was the Great Harbour, now an open bay; on the west lay the port of Eunostos, with its inner basin Kibotos, now vastly enlarged to form the modern harbour. In Strabo 's time (latter half of the 1st century BC), the principal buildings were as follows, enumerated as they were to be seen from a ship entering

12342-474: 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

12463-451: 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

12584-440: 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

12705-517: 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

12826-496: 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

12947-573: 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

13068-468: The western suburb of Alexandria in Borg el Arab city. Only the outer wall and the pylons remain from the temple. There is evidence to prove that sacred animals were worshiped there. Archaeologists found an animal necropolis near the temple. Remains of a Christian church show that the temple was used as a church in later centuries. Also found in the same area are remains of public baths built by the emperor Justinian,

13189-520: The year 38 AD, disturbances erupted between Jews and Greek citizens of Alexandria during a visit paid by King Agrippa I to Alexandria, principally over the respect paid by the Herodian nation to the Roman emperor , which quickly escalated to open affronts and violence between the two ethnic groups and the desecration of Alexandrian synagogues. This event has been called the Alexandrian pogroms . The violence

13310-461: 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

13431-431: 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

13552-465: Was called Alexándreia hḗ kat' Aígypton ( Ἀλεξάνδρεια ἡ κατ' Αἴγυπτον ), which some sources translated as "Alexandria by Egypt", as the city was, at that time, in the periphery of Egypt proper (the area beside the Nile ). Some of the Alexandrian and Greek populaces, e.g., Hypsicles , also referred to the city as Alexándreia hḗ prós Aígypton ( Ἀλεξάνδρεια ἡ πρός Αἴγυπτον , "Alexandria near Egypt"). In

13673-589: Was devastated by a tsunami ( 365 Crete earthquake ), an event annually commemorated years later as a "day of horror". In 619, Alexandria fell to the Sassanid Persians . The city was mostly uninjured by the conquest and a new palace called Tarawus was erected in the eastern part of the city, later known as Qasr Faris, "fort of the Persians". Although the Byzantine emperor Heraclius recovered it in 629, in 641

13794-561: 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

13915-472: Was founded originally in the vicinity of an Egyptian settlement named Rhacotis (that became the Egyptian quarter of the city). Alexandria grew rapidly, becoming a major centre of Hellenic civilisation and replacing Memphis as Egypt's capital during the reign of the Ptolemaic pharaohs who succeeded Alexander. It retained this status for almost a millennium, through the period of Roman and Eastern Roman rule until

14036-409: Was intended to supersede the older Greek colony of Naucratis as a Hellenistic centre in Egypt and to be the link between Greece and the rich Nile valley. A few months after the foundation, Alexander left Egypt and never returned to the city during his life. After Alexander's departure, his viceroy Cleomenes continued the expansion. The architect Dinocrates of Rhodes designed the city, using

14157-502: Was mainly in charge of overseeing Alexandria's early development, the Heptastadion and the mainland quarters seem to have been primarily Ptolemaic work. Inheriting the trade of ruined Tyre and becoming the centre of the new commerce between Europe and the Arabian and Indian East, the city grew in less than a generation to be larger than Carthage . In one century, Alexandria had become

14278-464: 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

14399-565: Was quelled after Caligula intervened and had the Roman governor, Flaccus, removed from the city. In 115 AD, large parts of Alexandria were destroyed during the Diaspora revolt , which gave Hadrian and his architect, Decriannus , an opportunity to rebuild it. In 215 AD, the emperor Caracalla visited the city and, because of some insulting satires that the inhabitants had directed at him, abruptly commanded his troops to put to death all youths capable of bearing arms. On 21 July 365 AD, Alexandria

14520-401: Was the site of a failed assassination attempt on Gamal Abdel Nasser . Europeans began leaving Alexandria following the 1956 Suez Crisis that led to an outburst of Arab nationalism . The nationalisation of property by Nasser, which reached its highest point in 1961, drove out nearly all the rest. Alexandria is located in the country of Egypt, on the southern coast of the Mediterranean. It

14641-499: 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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