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116-555: Mayadin has been identified to be the ancient Audattha known to Ptolemy , though some suggest Audattha was where Haditha now stands in Iraq. Mayadin is the successor of the medieval town and fortress of Rahbat Malik ibn Tawk , founded by the Abbasid lord and the original town's namesake, Malik ibn Tawk . Strategically located at a crossroads on the western bank of the Euphrates and considered

232-417: 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

348-601: 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

464-470: 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

580-695: A fall in the number of armored divisions reported from the 2010 edition from eight to seven. The independent armored brigade had been replaced by an independent tank regiment. In 2009 and 2010, according to the International Institute for Strategic Studies in London, the Syrian army comprised 220,000 regular personnel, and the entire armed forces (including the navy, air force and air defenses) had 325,000 regular troops. Additionally, it had about 290,000 reservists. The vast majority of Syrian military equipment

696-402: 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

812-541: A hill overlooking the town, which was captured on 22 November. This gave the rebels control of a large amount of territory east of the base to the Iraqi border. On 3 July 2014, ISIL captured Mayadin after ousting the FSA and raised their black standard . A local underground resistance movement of Sunni Muslim fighters attacked ISIL checkpoints in the city in 2015. This forced ISIL to dig a 15 km (9 mi) defensive position around

928-402: A leaning minaret . According to Czech explorer Alois Musil , who visited in 1912, Mayadin had a garrison of twelve gendarmes , ten policemen and ten mule riders. There was a boys' primary school in the town. The population was about 2,500, consisting of roughly four hundred Muslim families, fifteen Syriac Orthodox families (mostly refugees from Mardin ), and three Jewish families, living in

1044-492: 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

1160-587: 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

1276-461: 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

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1392-543: 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

1508-478: 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

1624-536: A total of 380 houses. On June 19, 1947, Pan Am Flight 121 , crewed by third officer Gene Roddenberry (who went on to create the original Star Trek television series ), crashed 4 miles (6.4 km) from the town. During the Syrian Civil War, Free Syrian Army captured the town in late August 2012 after fighting in the town. The only part still in regime hands was the Mayadin military base, an artillery position on

1740-553: 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.,

1856-572: 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;

1972-672: 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

2088-578: 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

2204-622: 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

2320-597: Is the land force branch of the Syrian Armed Forces . It is the dominant military service of the four uniformed services, controlling the most senior posts in the armed forces, and has the greatest manpower, approximately 80 percent of the combined services. The Syrian Army originated in local military forces formed by the French after World War I, after France obtained a mandate over the region. It officially came into being in 1945, before Syria obtained full independence

2436-462: 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

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2552-562: 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

2668-691: The 11th Armored Division has stayed close to its bases in Homs and Hama. The European Council named Major General Wajih Mahmud as commander of the 18th Armored Division in the Official Journal of the European Union on 15 November 2011, sanctioning him for violence committed in Homs . Henry Boyd of the IISS noted that "in Homs , the 18th Armored Division was reinforced by Special Forces units and ... by elements of

2784-537: The 1954 Syrian coup d'etat . Further coups followed, each attended by a purge of the officer corps to remove supporters of the losers from the force. 'Discipline in the army broke down across the board as units and their commanders pledged their allegiance to different groups and parties. Indeed, by the late 1950s, the situation had become so bad that Syrian officers regularly disobeyed the orders of superiors who belonged to different ethnic or political groups. The 1963 Syrian coup d'état had as one of its key objectives

2900-546: The 1982 Lebanon War . In 1984, Major General Ali Haidar 's Special Forces were instrumental in blocking an abortive attempt by Rifaat Assad and his Defense Companies to seize the capital. Fayadh's 3rd Armoured Division moved into the capital to join Haidar's forces in the confrontation with the Defense Companies. The 3rd Armoured Division, it seems, had historically been based at al-Qutayfah , near Damascus. Bennett dates

3016-662: 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

3132-410: 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

3248-601: The Islamist uprising in Syria in 1979–1982. In March 1980 the 3rd Armored Division and detachments from the Defense Companies arrived in Aleppo. The division was under the command of General Shafiq Fayadh , Hafiz Assad 's first cousin. The troops sealed "off whole quarters and carr[ied] out house-to-house searches, often preceded by tank fire." Hundreds of suspects were rounded up. Only two conventional Army brigades deployed to Hama in 1982,

3364-645: 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

3480-784: 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

3596-723: The Republican Guard and the 4th Armored Division , which are commanded by Bashar al-Assad's brother Maher , are exclusively Alawite. Most of Syria's 300,000 conscripts in 2011 were Sunni. Since 2022, the Minister of Defense and also Deputy Commander-in-Chief of the Army and the Armed Forces Lieutenant General Ali Mahmoud Abbas , and Major General Mufid Hassan, Deputy Chief of the General Staff, are some of

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3712-605: The Syrian Observatory for Human Rights estimated "tens of thousands" soldiers to have defected. By August 2012, 40 Brigadier generals from the Army had defected to the opposition army, out of a total of 1,200 generals. On June 14, 2013, 73 Syrian Army officers and their families, some 202 people in total, sought refuge in Turkey. Amongst their number were seven generals and 20 colonels. In 2013, Agence France Press wrote on 'Syria's diminished security forces.' Up until July 2012,

3828-429: The Syrian Observatory for Human Rights – are mainly Sunni without access to vital command and control, Nerguizian said, however the formed Syrian Minister of Defense General Dawoud Rajiha killed in the 18 July 2012 Damascus bombing was a Christian . The army in Syria is the power structure. The armed forces would fight to an end. It would be a bloodbath, literally, because the army would fight to protect not only

3944-457: 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

4060-461: 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

4176-519: 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

4292-430: 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

4408-579: The 10 October 2017, the town was besieged by the SAA and fighting had begun in the suburbs in preparation to storm the town. On 11 October 2017, the Syrian Army made huge advances inside the town of Mayadin and has taken control of about 60 percent of the town. On 14 October 2017, the Syrian Army retook the town thus ending the 4 year long ISIL rule over it. In June 2018, ISIL unsuccessfully attempted to retake

4524-628: The 12th in the north, holding the sector from the B'nat Ya'acov bridge to the slopes of Mount Hermon , the 35th in the south from the B'nat Ya'acov bridge to the Yarmuk River border with Jordan, and the 42nd in reserve, earmarked for a theater-level counterattack role. During the Six-Day War Israeli assault of the Golan heights, the Syrian army failed to counterattack the Israelis as the Israelis breached

4640-673: The 1940s. In 1919, the French formed the Troupes spéciales du Levant as part of the Army of the Levant in the French Mandate for Syria and the Lebanon . The former with 8,000 men later grew into both the Syrian and Lebanese armies. This force was used primarily as auxiliaries in support of French troops, and senior officer posts were held by Frenchmen, although Syrians were allowed to hold commissions below

4756-412: The 1st Armored Division had historically been at al-Kiswah . On 29 September 2004, Jane's Defence Weekly reported that Syria had begun to redeploy elements of one or more Syrian Army special forces regiments based in the coastal hills a few kilometres south of Beirut in Lebanon. A senior Lebanese Army officer told JDW that the 3,000 troops involved would return to Syria. Cordesman wrote that in 2006

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4872-476: The 3rd Armored Division's 47th Armored and 21st Mechanized Brigades. Three quarters of the officers and one third of the soldiers in the two brigades were Alawites. Most of the repression was carried out by the Defense Companies and the Special Forces. Meanwhile, the Special Forces were isolating and combing through Hama , killing and capturing suspected government opponents. Syrian forces fought Israel during

4988-713: The 3rd Corps and 17th and 18th Armoured Divisions were established in 1986. The 9th Armoured Division served in the 1991 Persian Gulf War as the Arab Joint Forces Command North reserve and saw little action. In 1994, Haidar expressed objections to the Syrian president's decision to bring Bashar home from his studies in Britain and groom him for the succession after the death of Basil, the eldest Assad son. Soon afterwards, on 3 September 1994, Jane's Defence Weekly reported that then-President Hafez Assad had dismissed at least 16 senior military commanders. Among them

5104-421: The 4th Division under Maher's de facto command." Information from Holliday 2013 suggests that the reserve armored division is the 17th (rather than any other designation), which was responsible for eastern Syria. The division's 93rd Brigade left Idlib to secure Raqqa Governorate in early 2012. Following the reported capture of Raqqa on 3–6 March 2013 , elements of the 17th Division remained under siege to

5220-587: The Army more flexibility and to improve combat efficiency by decentralizing the command structure, absorbing at least some of the lessons learned during the Israeli invasion of the Lebanon in 1982." The organization and military doctrine of the army followed the Soviet model. Richard Bennett's estimate of the 2001 order of battle was: Bennett said the 1st Corps also [had] four independent special forces regiments, including two trained for heliborne commando operations against

5336-468: The Druze population, who have clashed with regime security forces and broken Druze youths out of regime imprisonment to avoid them serving in the army. Increasingly, Assad's Alawite base of support refuse to send their sons to the military due to massive casualty rates among military age men in their community; according to pro oppositions sources a third of 250,000 Alawite men of fighting age have been killed in

5452-436: 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

5568-473: 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

5684-863: The Jordanian Army at al-Ramtha on 21 September, after fierce air attacks on 22 September, the Syrians stopped the attack and began to retreat.The retreat was caused by Jordan's appeal for international aid : "The report said that Hussein “not only appealed for the moral and diplomatic support of the United Kingdom and the United States, coupled with the threat of international action, but had also asked for an air strike by Israel against Syrian troops.” (New York Post) After 1970 further Syrian engagements included: The Syrian armed forces have also been involved in suppressing dissident movements within Syria, for example

5800-497: 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

5916-487: The SAA had incurred at least 35,601 fatalities, which when combined with a reasonable ratio of 3 wounded personnel for every soldier killed and approximately 50,000 defections, suggests the SAA presently commands roughly 125,000 personnel. This loss of manpower is exacerbated by Syria's longentrenched problem of having to selectively deploy forces based on their perceived trustworthiness." The International Institute for Strategic Studies in London calculated that by August 2013

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6032-455: 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

6148-630: The Sunni Muslims in the positions of power. Some volunteer brigades, such as Arab Nationalist Guard , are made up of Sunni Syrians and other Sunnis from the Middle Eastern region that adhere to pan-Arab ideals. Before 2011, it was difficult to access reliable information about the SAA because of the Damascus government's sensitivity to potential espionage, particularly by Israel. Richard Bennett wrote in 2001 that "..corps [were] formed in 1985 to give

6264-631: The Syrian Army had "organized two corps that reported to the Land Forces General Staff and the Commander of the Land Force." As of 2010, the army's formations included three army corps (the 1st , 2nd, and 3rd), eight armored divisions (with one independent armored brigade), three mechanized divisions, one armored-special forces division and ten independent airborne-special forces brigades. The army had 11 divisional formations reported in 2011, with

6380-498: The Syrian Civil War, leading to major tensions between the sect and the Syrian government. As of mid-2018, then-Israeli Defence Minister Avigdor Lieberman said that the Syrian Arab Army had regained its pre-2011 strength levels, recovering from manpower shortages earlier in the Syrian Civil War. The 3rd Armored Division has deployed elements of three brigades from its bases around Qutayfah to Deraa, Zabadani, and Hama, while

6496-493: The Syrian army. These troops were mostly grouped into three infantry brigades and an armored force of about battalion size," writes Pollack. Between 1949 and 1966, a series of military coups destroyed the stability of the government and any remaining professionalism within the army. In March 1949, the chief of staff, General Husni al-Za'im , installed himself as president. Two more military dictators followed by December 1949. General Adib Shishakli then held power until deposed in

6612-605: The Syrian government became involved in Black September in Jordan when it sent a reinforced armored brigade to aid the Palestine Liberation Organization . Syrian armored units crossed the border and overran Irbid with the help of local Palestinian forces. They encountered several Jordanian Army detachments, but rebuffed them without major difficulty. Two days later, the 5th Infantry Division, heavily reinforced,

6728-649: The Syrian positions. While Syrian units fought hard whenever the Israelis entered their fields of fire, no attempts appear to have been made to exploit Israeli disorientation and confusion during the initial assault. Judging from reports of 1967–1970, including the reporting of the 5th Infantry Division in 1970, the Army appears to have formed its first divisions during this period. The 1st and 3rd Armored Division , and 5th , 7th , and 9th Mechanized Infantry Divisions were all formed prior to 1973. Samuel M. Katz writes that after Hafez al-Assad gained power in November 1970,

6844-449: The Troupes du Levant, they were strengthened and became the main forces of the French apparatus. In 1927, the force was augmented by North African infantry ( tirailleurs ) and cavalry ( spahis ), French Foreign Legion , Troupes de marine infantry and artillery units (both French and Senegalese ). The whole force constituted the Army of the Levant . In August 1945, the Syrian Army

6960-403: The UK-based Syrian Observatory for Human Rights , however estimated that less than 1,000 soldiers had deserted the Syrian Army; at the same moment, an FSA battalion commander claimed that the FSA embraced 25,000 army deserters. Also in November 2011, the Free Syrian Army or the website of France 24 estimated the Syrian Army at 200,000 troops. According to General Mustafa al-Sheikh , one of

7076-422: 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

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7192-423: 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

7308-481: The army did appear to have some strength. It had around 70,000 personnel, roughly 550 tanks and assault guns, 500 APCs, and nearly 300 artillery pieces. The army had sixteen brigades: twelve infantry, two armored (probably including the 70th Armored), and two mechanized. The Syrian government deployed twelve of the sixteen brigades to the Golan , including both armored brigades and one mechanized brigade. Three 'brigade groups', each comprising four brigades, were deployed:

7424-455: The army expanded to the five divisions listed above, plus ten independent brigades, an artillery rocket brigade (the 69th), and "a reinforced brigade variously termed the 70th Armored Brigade or the Assad Republican Guard. It is today known as the Armored Defense Force; as Assad's praetorian guard it is stationed in and around Damascus and subordinate to the Defense Companies under the command of Assad's brother Rifa'at ." On 18 September 1970,

7540-403: 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

7656-435: The challenge of relying on units to carry out orders to brutalize the opposition." This has resulted in Bashar's following his father's precedent by attaching regular army units to more reliable forces (Special Forces, Republican Guard, or 4th Armored Division). When Hafez al-Assad directed the suppression of revolts in Hama in 1982, this technique was also used. In 2014, analyst Charles Lister wrote that "As of April 1, 2014,

7772-548: The city. On 3 April 2017, during the SDF 's offensive to capture Raqqa , it was reported that ISIL was possibly in the process of moving its capital from Raqqa city to Mayadin. This followed months of gradual relocation of resources and senior ISIL leaders from Raqqa to Mayadin. On 21 April 2017, the United States announced that they had conducted a ground raid in Mayadin and killed Abdulrakhman Uzbeki, an ISIS leader. On 18 June 2017, Iran hit ISIL targets in Mayadin using domestic-based surface-to-surface mid-range missiles. By

7888-458: 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,

8004-626: 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

8120-402: 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

8236-400: The early 20th century, Mayadin was the administrative seat of the Asharah kaza (subdistrict) of the Sanjak of Zor district and contained the residence of its qaimmaqam (governor). In a British military intelligence report from the 1900s, the town had a population of 2,000 mostly Sunni Muslims and a small minority of Christians. There was a bazaar , several shops and a mosque with

8352-469: 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

8468-543: 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

8584-425: 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

8700-648: The establishment of corps in the Syrian Army to 1985. Writing forty years later, Tom Cooper says "..despite the establishment of.. corps.. most division commanders continued reporting directly to the President . Correspondingly, not only the Chief of Staff of the Syrian Armed Forces but also the Corps HQ exercised only a limited operational control over the Army's divisions." Declassified CIA documents from February 1987 say that

8816-419: 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,

8932-694: The following year. Since 1946, it has played a major role in Syria's governance, mounting six military coups: two in 1949, including the March 1949 Syrian coup d'état and the August 1949 coup by Colonel Sami al-Hinnawi , and one each in 1951, 1954 , 1963 , 1966 , and 1970 . It has fought four wars with Israel ( 1948 , the Six-Day War in 1967, the Yom Kippur War of 1973, and 1982 Lebanon War ) and one with Jordan ( Black September in Jordan , 1970). An armored division

9048-442: The formation of other elite units, many of which receive direct assistance from Russia. In 2011, the majority of the Syrian military were Sunni , but most of the military leadership were Alawites . Alawites made up 12% of the pre-war Syrian population, but 70% of the career soldiers in the Syrian Army. A similar imbalance is seen in the officer corps, where some 80% of the officers are Alawites. The military's most elite divisions,

9164-529: The fortress about four kilometers southwest of the original site. The new settlement, known as "al-Rahba al-Jadida", remained the significant center of the Euphrates region through much of the Ayyubid – Mamluk era (12th–15th centuries), and today is a ruined fortress known as " Qal'at al-Rahba ". The original settlement eventually became known as "Mashhad Rahba". The latter was located at the present site of Mayadin. In

9280-497: 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: Syrian Army The Syrian Army ( SyA or SA ), officially the Syrian Arab Army ( SyAA or SAA ; Arabic : الجيش العربي السوري , romanized :  al-Jayš al-ʿArabī as-Sūrī ),

9396-553: 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

9512-485: The institution of the army but the regime itself, because the army and the regime is one and the same. — Fawaz Gerges , Lebanese-American author Analyst Joseph Holliday wrote in 2013 that "the Assad government has from the beginning of the conflict been unable to mobilize all of its forces without risking largescale defections. The single greatest liability that the Assad regime has faced in employing its forces has been

9628-599: 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

9744-599: The key to Syria from Iraq, control of the town was highly contested by the Muslim powers and Bedouin tribes of the region. It grew to become one of the major Muslim towns of the Euphrates valley and was an administrative center. An earthquake destroyed Rahbat Malik ibn Tawk in 1157 , after which it was granted by the Zengid ruler Nur ad-Din to Asad ad-Din Shirkuh , the paternal uncle of future Ayyubid sultan, Saladin . Shirkuh relocated

9860-500: 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

9976-555: 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

10092-484: The most senior defectors, however, in January 2012 the Syrian forces were estimated at 280,000 including conscripts. By March 15, 2012, many more soldiers, unhappy with crackdowns on pro-democracy protesters, switched sides and a Turkish official said that 60,000 soldiers had deserted the Syrian army, including 20,000 since February 20. It was added that most of the deserters were junior officers and soldiers. By 5 July 2012,

10208-477: 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

10324-474: The north of the city in October 2013. The National Defense Force is under the control and supervision of the Syrian Army and acts in an infantry role, directly fighting against rebels on the ground and running counter-insurgency operations in co-ordination with the army which provides them logistical and artillery support. Struggling with reliability issues and defections, officers of the SAA increasingly prefer

10440-461: 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

10556-500: The part-time volunteers of the NDF, who they regard as more motivated and loyal, over regular army conscripts to conduct infantry operations and act as support for advancing tanks. An officer in Homs, who asked not to be identified, said the army was increasingly playing a logistical and directive role, while NDF fighters act as combatants on the ground. The NDF continues to play a significant role in military operations across Syria despite

10672-401: 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

10788-582: The rank of major. The Syrian officer corps of the Troupes spéciales du Levant mainly consisted former officers of the Ottoman Army and members of Syria's ethnic and religious minorities. By 1927, more than 35% of Syrian soldiers came from the auxiliary troops; they were traditionally Kurdish , Druze or Circassian. After the repression of the Great Syrian Revolt by General Maurice Gamelin , commander of

10904-486: 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

11020-473: The scale of defections from the Syrian Army, though hard to quantify, was too small to make an impact on the strength of that army, according to Aram Nerguizian from the Washington-based Center for Strategic and International Studies . Strategically important units of the Syrian armed forces are always controlled by Alawite officers; defecting soldiers – by July 2012 "tens of thousands" according to

11136-405: 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

11252-615: The seizure of the Al-Kiswah military camp, home to the 70th Armored Brigade. In June 1963, Syria took part in the Iraqi military campaign against the Kurds by providing aircraft, armoured vehicles and a force of 6,000 soldiers. Syrian troops crossed the Iraqi border and moved into the Kurdish town of Zakho in pursuit of Barzani 's fighters . There was another 1966 Syrian coup d'etat . However, in 1967

11368-474: 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

11484-451: 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

11600-405: The strength of the Syrian army had, compared with 2010, roughly been cut in half, due to defections, desertions and casualties: it now counted 110,000 troops. The Syrian Arab Army suffers from serious recruitment issues as the Syrian Civil War drags on, with military age men across sectarian lines no longer willing to join or serve their conscription terms. These issues are especially notable among

11716-440: 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

11832-517: 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

11948-496: 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

12064-573: 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

12180-496: The town . There is a football club in the city called Al-Mayadin SC , which plays the second highest competition in Syria. Mayadin has a hot desert climate ( Köppen climate classification BWh ). 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)

12296-461: 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

12412-594: Was Haidar, then commander of the Special Forces, and General Shafiq Fayadh , a cousin of the President who had commanded the "crack" 3rd Armored Division for nearly two decades. The 3rd Armored Division was "deployed around Damascus." JDW commented that "the Special Forces and the 3rd Armored Division, along with the 1st Armored Division are key elements in the security structure that protects Assad's government. Any command changes involving those formations have considerable political significance." Post-uprising reporting indicated

12528-522: Was Soviet manufactured. At October 1, 2011, according to high-ranking defected Syrian Colonel Riad Assaad, 10,000 soldiers, including high-ranking officers, had deserted the Syrian Army. Some of these defectors had formed the Free Syrian Army , engaging in combat with security forces and soldiers in what would turn into the Syrian Civil War . At 16 November 2011, Rami Abdel Rahman, the head of

12644-539: Was also deployed to Saudi Arabia in 1990–91 during the Gulf War , but saw little action. From 1976 to 2005 it was the major pillar of the Syrian occupation of Lebanon . Internally, it played a major part in suppressing the 1979–82 Islamist uprising in Syria , and since early 2011 has been heavily engaged in fighting the Syrian Civil War , the most violent and prolonged war the Syrian Army has taken part in since its establishment in

12760-465: Was also sent into Jordan. Two armored brigades were attached to the division, bringing its tank strength up to over 300 T-55s and its manpower to over 16,000. The division entered Jordan at ar-Ramtha , destroyed a company of Jordanian Centurion tanks there, and continued directly towards Amman . Pollack says it is likely that they intended to overthrow the Jordanian monarchy itself. Despite defeating

12876-431: 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

12992-614: 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

13108-489: Was formed mainly from Army of the Levant . As Syria gained independence in 1946, its leaders envisioned a division -sized army. On June 19, 1947, the Syrian Army took the survivors of Pan Am Flight 121 to the Presbyterian mission hospital at Deir ez-Zor . The 1st Brigade was ready by the time of the Syrian war against Israel on May 15, 1948. It consisted of two infantry battalions and one armored battalion. The 2nd Brigade

13224-464: 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

13340-461: Was organized during the 1948 Arab–Israeli War and also included two infantry battalions and one armored battalion. At the time of the 1948 Arab–Israeli War , the army was small, poorly armed, and poorly trained. "Paris had relied primarily on French regulars to keep the peace in Syria and had neglected indigenous forces. Consequently, training was lackadaisical, discipline lax, and staff work almost unheard of. ... there were about 12,000 men in

13456-499: 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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