The Arabs took a interested fascination in the investigate of heavens. They created this fascination firstly, since they had once worshipped celestial bodies, (1) and secondly, since the dwellers of the dried who often journeyed at night in connection with trade, fight and emigration from a place to another, found the citation of their tour with the help of the stars. The coherent sky of the dried gave them a luck of creation correct observations. Therefore there was a few locally acquired expertise of the prearranged stars, the movements of the planets and the changes of the weather.
After the appearance of Islam, the Muslims had to establish the time of the prayers and the citation of the Ka'bah to spin their faces towards it at the time of prayers. For this role it was vital to know the rgreat heights of the object and the latitudes and longitudes of all the places where the Muslims lived. The same need arose is to alignment of the mosque. This gave a ! eremite procedure to the investigate of astronomy and the associated subjects such as astronomical embankment and mathematics. On the other hand, the Muslims, who once carried on thriving traffic all over the world and sometimes launched Jihad, had to go on the home and the sea. As an assist to travel, navigation and meteorology, a by product of navigation, they indispensable star maps. The prerequisite of such maps was moreover a result in of their fascination in astronomy.
There was a organisation of astronomers who believed in the change of celestial bodies on the terrestrial affairs, and the destiny and future of human beings. According to them, the conjecture of sub-lunar events from the subversion of the heavens, the signs of the zodiac in the forefather and the suit of the planets was possible. The scholarship dealing with such influences was termed as Astrology ('Ilm-Ahkam al-Nujum). Astrology, as a segment of astronomy, was complicated and created by very ! old Babylonians. The investigate of this art or scholarship wa! s then done in Greece and Rome, a few centuries before the gap of the Christian era. It was moreover artistic in India, China and Egypt. From the 7th to the 13th century it was serve created by the Muslims and after that on by the Europeans. In the 14th and the 15th centuries, the astrologers had great change on the kings of the European countries. (2) The traditional Muslims did not think in the change of the celestial bodies on destiny or the future of human beings.
The periodic investigate of astronomy and arithmetic was started at Baghdad in the second half of the 8th century during the power of the second 'Abbasi Caliph Al-Mansr. After that the clientele and goodwill of other Muslim rulers, quite of the seventh 'Abbasi Caliph Al-Ma'mun, supposing kick to the astronomical and mathematical researches of every kind. Indian, Persian and Greek astronomical functions were translated in to Arabic, and for creation the astronomical observations the observatories ! were determined by the caliphs and in isolation persons at assorted places in the Muslim world. Astronomy was complicated with great fascination with the result that the number of Muslim astronomers lifted surprisingly in a partial time of time, and by the finish of the 10th century, a considerable number of venerable Muslim astronomers collected in Baghdad. In the 11th and the 12th centuries astronomy flourished in Muslim Spain where a great treat of imaginative and initial work on this bend of scholarship was done.
The Muslim scientists trustworthy pinnacle significance to correctness in observations and calculations, without kind is to length of time indispensable for it. Therefore sometimes their astronomical researches lengthened for more than forty years. Due to this request of correctness the Muslims did not agree to as such the astronomical tables or measurements of Ptolemy, a great Greek astronomer and mathematician. They only agreed his solar theory! only to supply a basement for astronomical research. They themselves c! onducted astronomical researches in Baghdad, Samarqand, Nishapur, Cordova, Damascus and Ray, and after creation a clever investigate of the heavens they not only prepared and amplified Ptolemy's astronomical tables, but moreover compiled a number of new ones and drew up new star catalogues. On the basement of uninformed observations, the Ptolemaic network was repetitively criticized by the Muslim astronomers, quite those of Spain.
The investigations on astronomy were continued, and compartment the finish of the 11th century, scarcely all the initial and imaginative work was done by Muslims, and even the functions of non-Muslims were written in Arabic. Astronomy reached its top in the 13th and 14th centuries. In the 12th century, the Christians and Jews started the work of interpretation from Arabic in to Latin and Hebrew, and began to actions research in this field. But until the finish of the 13th century, no mathematical and astronomical work similar to tha! t of the Muslims could be constructed by the Christians or Jews. It is engaging to note that in the 12th century, whilst Ptolemy's astronomical work, Almagest, after a in depth investigate and research, was subjected to serious critique by Muslims quite those of Spain, the investigate of this work was started in the Latin world.
Besides compiling the astronomical tables, the Muslims prepared celestial globes on which the positions and magnitudes of the stars were represented. The globe is of Greek origin, but since Ptolemy's time there has been a successive alleviation on it. The Muslim scientists moreover wrote comprehensive books on astronomy and mathematics, and moreover calm treatises on assorted branches of this science.
The Muslim astronomers moreover prepared the star maps to persist the old astronomical knowledge, and to use them as an assist to travel, navigation and meteorology.
A great inducement is to investigate of ast! ronomy came from an Indian astronomical work called Siddhanta which was! brought to the justice of Baghdad by a Hindu declared Kanka. Kanka met Ya'qb Ibn Triq in 767 who was a of the paramount astronomers of his time. Ya'qb Ibn Triq introduced him to the Caliph Al-Mansr.(3) Kanka showed the book to the Caliph who systematic Muhammad Ibn Ibrahim Al-Fazri to interpret it in to Arabic.(4) He moreover systematic that a work formed on Siddhanta should be composed, which could serve as a anxiety book is to Arabs. Muhammad Ibn Ibrahim took this shortcoming and prepared a book which was called by the astronomers as Sind Hind al-Kabir (the great Siddhanta). (5) It was used until the time of the Caliph Al-Ma'mun. Then Al-Khwrizmi, who was a of the paramount scientists, prepared a outline of this book. He moreover compiled astronomical and trigonometrical tables according to the amalgamated methods of Indians, Persians and Greeks. These tables were revised by Maslamah al-Majriti (c. the second half of the 10th century). They gained so ample recognition th! at they were used even in China. In the 12th century, the interpretation of these tables was done in to Latin. (6) Al-Khawarizmi glimpsed in his functions on astral suit and the force of appeal the law of concept gravitation.
The astronomer Ibrahim Ibn Habib al-Fazri was the first Muslim who constructed astrolabes. He calm a poem on astrology, and compiled a Zij (calendar) according to the Arab method. He moreover wrote on the use of astrolabes and on the armillary spheres. (7)
In 762-63 the Persian astronomer and engineer, Naubakht, together with Masha' Allah (Latin Macellama, Macelarama, Messahala), done a consult before the office building of Baghdad. Masha' Allah (d. 815 or 820) was a of the beginning astronomers and astrologers, who flourished beneath the Caliph Al-Mansr. (8) Naubakht (d. 776-77) was the writer of a book on astrological judgments entitled Kitb al-Ahkam. (9)
During the power of the Caliph al-Ma'mun, the critic! al work of interpretation of Ptolemy's Almagest from Greek in to Arabic! was completed. The Caliph was very worried to obtain it translated correctly. It was translated several timed. Many commentaries on it were written. Its summaries were moreover made. The Minister Yahya Ibn Khalid Barmaki was the first to obtain it translated. A organisation of scholars wrote for him a narration on this book, but he did not similar to it. He allocated Abu Hasan and Salman who were trustworthy to the scientific academy called Bait al-Hikmah (The residence of wisdom) to write a narration on it.(10) The Almagest represents the most appropriate e.g. of Greek exemplary functions on astronomy. It served as a basement is to after that astronomical works. Al-Hajjaj Ibn-Yusuf was a of the first translators of the Almagest. He done this interpretation on the basement of a Syriac version. (11)
The Caliph al-Ma'mun (169-218 / 786-833) was very lustful of truth and science. The more he got proficient with the engaging problems of science, the more his fas! cination grew in the functional work. He built an look-out at Baghdad in his Bait al-Hikmah and other in the solid of Tadmor (Palmyra). In these observatories the essential elements of the Almagest similar to the inclination of the ecliptic, the length of the solar year, and the precession of the equinoxes were verified. Observations on the celestial motions were carried out and geodetic measurements were made. (12)
Al-Ma'mun systematic Ahmed, Muhammad and Hasan, who were venerable scientists and his courtiers, to portion in conspiring with other justice scientists the length of the terrestrial grade and the circumference' of the earth in a few immeasurable planes. The planes of Sinjar and Tadmor were choosen for this purpose. The astronomers stayed at a place and remarkable with the help of instruments the rgreat heights of the North. Pole, and pitched a spike there. Then restraining a long cord with the nail, they carried the cord in the citation of the North. Where ! the cord finished they pitched other spike and scored equally other cor! d with it, and proceeded in the same direction. They one after another this routine together with observations on the rgreat heights of the North Pole, until on reaching a specific mark they beheld that the rgreat heights of this Pole had increased by a degree. The stretch they covered was moreover measured, which was found to be 56 2/3 miles. From, these observations it was unspoken that for any terrestrial grade the stretch covered on the earth amounts to 56 2/3 miles. The same operation was steady in the citation of the South where at a mark they beheld that the rgreat heights had decreased by, a degree. The stretch covered was the same as in the first case. Now on augmenting this stretch by 360 which is the complete number of terrestrial degrees, the rim of the earth was found to be next to to 20,400 miles, and the hole next to to 6,500 miles. (13)
The arch of astronomers who carried observations beneath al-Ma'mun was Sanad Ibn 'Ali. He was a Jewish modif! y to Islam. He constructed an look-out (Kanisah) at the back of the Shamsiah Gate at the palace of Mu'izz al-Dawlah in Baghdad. An astronomical list and a few papers on astronomy and mathematics, inclusive a book on Arabic numerals, are ascribed to him. (14)
'Ali Ibn 'Isa al-Astur1bi who flourished in Baghdad and Damascus in the first half of the 9th century, took segment in the dimensions of the length of the terrestrial grade systematic by al-Ma'mun. He done astronomical observations at Baghdad and Damascus from 829 to 833. He was the famous constructor of astrolabes; as a result the nickname al-Asturlbi (maker of astrolabe). He wrote a dissertation on astrolabes, which is a of the beginning functions on this instrument. (15)
Yahya Ibn Abi Mansr moreover took segment in the observations done at Baghdad in 829-30, and compiled the astronomical tables called Ma'munic tables. Like the tables of Habash these, too, are a collective work of 'various ! astronomers. Al-Marwarudhi, who moreover flourished beneath al-Ma'mun, ! done solar observations. (16)
In the 9th century astronomy flourished in the East, Astronomical researches were conducted in the observatories of Baghdad, Damascus and other places. More initial and softened work was done in the second half of the 10th century. The gain of trigonometry, which was deliberate to be a bend of astronomy at that time, was moreover continued. A great consideration was paid to the construction of great astronomical instruments, notably to the round astrolabe which was newly introduced at that time. Hamid Ibn 'Ali was a famous constructor of round astrolabes. Jbir Ibn Sinan was moreover a creator of this together with of other astronomical instruments. According to al-Biruni, he was the first to make a round astrolabe. Al-Nairizi wrote on this instrument an detailed dissertation which represents the most appropriate Arabic work on this topic. In this dissertation the author, after giving the introduction, describes the instruments, an! d gives its applications. Beside this work, al-Nairizi compiled astronomical tables. A great scientist al-Mhani done for 33 years (833-886), a array of observations on stellar and solar eclipses and solar conjunctions. Another astronomer of this time Ahmad al- Nahwandi, who flourished at the time of Yahya Ibn Khalid Ibn Barmak, done astronomical observations at Jundishapur and compiled tables called Mushtamil. (17)
After carrying out astronomical observations for 10 years (825 to 835) Habash al-Hsib compiled 3 astronomical tables. The first were according to the Hindu way (based on Siddhanta). The second called Al-Zij al-Mumtahan (the "tested Tables") were according to the Arab method. They were very critical and were may due to the co-operative efforts of al-Ma'mun's astronomers. The third called Al-Zij Al-Saghir (the tiny tables) was ordinarily well known as the Tables of Shah. Habash al-Hsib determined the time of the solar obscure of the year 829. He was t! he first to establish time by an rgreat heights (in this case, of the s! un). This way was normally agreed and adopted by Muslim astronomers. (18)
The most shining academician of this age, and a of the paramount astronomers of Islam, was 'Abd Allah Muhammad Ibn Jbir Ibn Sinan al-Battni (Latin; Albategnius, Albatenius). His ancestors were Sabeans of Harran, but he himself was a Muslim. He carried out astronomical observations of a far-reaching operation and with remarkable correctness for about 41 years (877-918). He determined many astronomical co-efficients, similar to the precession 54.5" a year, inclination of the ecliptic 23 35', with great accuracy. He beheld an enlarge of 16 47' in the longitude of the sun's apogee since Ptolemy's time. This led to the breakthrough of the suit of the solar apsides and of slow movement in the equation of time. Al-Battni valid the probability of the annular eclipses of the sun. He moreover wrote many astrological works. His principal work is a considerable astronomical dissertation inclusive t! he astronomical tables. His tables enclose a catalog of prearranged stars is to year 880-81. His work is an allege on that of al-Khwrizmi, and shows more dissimilarity from Indian methods. Observations concerning the first appearance of the new moon, the length of the tropic and sidereal year, the obliquity of the ecliptic, the stellar anomalies, the parallaxes, etc., are more complicated and more fairly done by al-Battni than by al-Khwrizmi
Al-Battni's astronomical dissertation was translated in to Latin and spanish in the 12th and 13th centuries respectively. It exerted a great change on the European scholars of the center Ages and Renaissance. (l9)
Thbit Ibn Qurrah (d. 901) who was a physician, mathematician, astronomer and translator from Greek and Syriac in to Arabic published his solar observations done at Baghdad. He quite determined the rgreat heights of the object and the length of the solar year. (20)
The astronomer and ! mathematician Wijan Ibn Rustam al-Khi wrote many astronomical and mathe! matical works, inclusive a dissertation on the construction of the astrolabe. He was the head of the astronomers working in 988 at the Buwayhid Sharaf al-Dawlah's observatory. (21) His co-worker Ahmad Ibn Muhammad al-Saghni was the contriver and creator of astronomical instruments. Abu'l-Waf is mentioned to be the precursor of the variation, the third disparity of the moon; a breakthrough which was after that ascribed to Tycho Brahe. (22)
'Ali Ibn al-Husain al-'Alawi (d. 985) showed a remarkable correctness in observations. He compiled astronomical tables which remained very renouned for at least two centuries. (23)
Now you come to a famous astronomer of the 10th century, declared Abu'l-Husain 'Abd al-Rahman al-Sufi. He was innate in Ray (Persia) in 903, and died in 966. He was a distinguished astronomer of the Gothic times. His expertise of both the Islamic and Greek astronomy, quite uranometry, was comprehensive. He was the first to watch the ! change of the colour of stars, the change in the extend of stars, the proper suit of stars, the long time non-static stars and the Southern constellations which have been poorly ascribed by modern astronomers to a few after that ones.
Abd al-Rahman al-Sufi was patronized by the Buwayhid woman monarch Adud al-Dawlah (949-982) who was a great benefactor of astronomy, and had built an look-out at Shiraz. Al-Sufi wrote is to woman monarch a book on uranometry, entitled Suwar al-Kawkib (The book of the prearranged stars). In this book he gives a complete description of the constellations of the heavens. He moreover gives the location of any star of the constellations, illustrating with pictures. The book contains 55 astronomical tables along with illustrations of 48 constellations in 96 diagrams as seen in the heavens. The artistic worth of the impressive illustrations in the Mss. of this work is very great, and represents a of the most appropriate examples of the Persian p! ocket-sized paintings. Al-Sufi has not only prepared the errors of obse! rvations in the work of his predecessors similar to al-Battni, but also, sharp out many inadequate observations found in Ptolemy's Almagest. He tangible delicately the bounds of any constellation, and available the magnitudes and positions of stars after creation new observations.
The Suwar al-Kawkib is a of the 3 masterpieces of observational astronomy of the Gothic times; the other two being the catalogues of Ibn Ynus and Ulugh Beg prepared in the 12th and 15th centuries respectively. It is an add-on to the Muslims' expertise on uranometry. The after that astronomers, similar to al-Biruni, Alfonso, Prince of Castile, Khwjah Nsir al-Din Tusi, Prince Ulugh Beg and Jai Singh II, formed their catalogues of stars on this genuine catalogue. This work was translated in to Latin, French and Persian, and a narration on it was written in Spanish.
It served as a basement for after that functions in Western Europe. The modern astronomers similar to Hauber, Down, A! rgelander, Ideler, Schellerup and Knobel had done an endless use of it.
Al-Sufi prepared a excellent celestial globe. Several celestial globes which casing the time from the 11th to the 18th century uncover the star positions and magnitudes according to al-Sufi. He showed a remarkable correctness in the pattern of the astrolabes. He wrote a dissertation on this instrument. In this dissertation he throws light on the astronomical techniques as practiced it that time. (24)
Another great astronomer and a of the paramount Muslim astronomers was Abu'l-Hasan Ali Ibn Abi Said 'Abd al-Rahman Ibn Ahmad Ibn Ynus al-Sadafi, normally well known as Ibn Ynus. He was well capable in Arabic literature, communication and history, and had expertise of many other subjects. He belonged to Egypt where he died in 1009. He was a courtier of the Fatimi Caliph al-'Aziz Billah (975-996). He got a luck of working in a well-equipped look-out which was the segment of a Mus! lim academy of science, declared Dar al-Hikmah (the residence of wisdom! ) founded in Cairo by the Fatimi rulers. He done astronomical observations, and by the demand of the Caliph al-'Aziz he compiled the astronomical tables. The work of collection of these tables was started in 990 during the lifetime of the Caliph, but it was completed after his demise beneath his son al- Hakim (966-1020). Hence they were declared after him Al-Zij al-Kabir al-Hakimi. In these tables he entered his observations about the eclipses and conjunctions, old and new, softened values of astronomical constants (inclination of the ecliptic, 23 35'; longitude of the sun's apogee, 86 10'; solar parallax marked down from 3' to 2'; precession, 51.2" a year). He gave an account of the geodetic measurements which were carried on by the demand of the Caliph al-Ma'mun in the ninth century.
Ibn Ynus in his astronomical tables (written in 4 volumes) prepared the errors of observations in the astronomical tables of his predecessors. The people of Egypt relied on these tables.! It is mentioned that after their collection the use of all the formerly tables in the world was given up. Even the astronomers of China severely employed them. The interpretation of a considerable segment of the tables, solely the sequential section, has been done in French in 1804.
Beside these-tables, Ibn Ynus has calm many books. One of these is Jadawil al-Samt (the tables of direction), and the other is the Jadawil al-Shams wa'l-Qamar (the tables of the object and the moon). (25)
A famous astronomer of the 11th century, who belonged to Cordova (Spain), was Abu Ishaq Ibrahim Ibn Yahya al-Naqqsh, ordinarily well known as Ibn al-Zarqli or al-Zarqli (Latin: Arzachel). He was moreover an venerable astronomer of this century. He lived from 1029 to 1087. He was the most appropriate spectator of his time, who done astronomical observations for about 19 years (1061-1080). He invented an softened astrolabe called Safihah (Saphaea Arzachelis) on whic! h he moreover wrote a treatise. It was translated in to Latin, Hebrew a! nd many vernaculars. Al-Zarqli was the first to infer categorically the suit of the solar apogee with anxiety to the stars. According to his calculations it was next to to 12.04" per year (the actual worth being 11.8"). He edited the solar tables called Toledan Tables. These tables were may the result of the observations done in Toledo by him and by a great spectator Ibn Said in conspiring with other Muslim and Jewish astronomers. They were translated in to Latin and enjoyed ample fame. (26)
A famous astronomer, mathematician and poet, 'Umar Ibn al-Khayym, reformed the old Persian monthly calendar which had been transposed by the Islamic monthly calendar after the Muslim acquisition of Persia. This reformed monthly calendar was called Al-Trikh al-Jalli after the name of the Saljuq Sultan Malik Shah Jalal al-Din who in 1074-75 called 'Umar Ibn al-Khayym to his look-out for creation this reform. Many interpretations have been given to it. Each interpretation is! accurate to a certain degree, but at any rate 'Umar's monthly calendar was may more accurate than the Gregorian (Christian) calendar. Three interpretations, the second of which seems to be the most accurate, are being quoted here along with the control giving the interpretation and the consequent error.
1. Al-Shirzi's interpretation: 17 intercalary days in 70 years;' error. 1 day in about 1540 years.
2. Ulugh Beg's interpretation: 15 intercalary days in 62 years; error, 1 day in about 3770 years.
3. Modern interpretation: 8 intercalary days in 33 years: error, 1 day in about 5,000
(in the Gregorian monthly calendar there is an blunder of 1 day in 3330 years). (27)
The paramount astronomer of the 12th century, who moreover belonged to Spain, was Abu Muhammad Jbir Ibn Aflah. He was innate or lived in Seville. He energetically criticized the Ptolemaic theory of planets, and wrote a book on astronomy entitled Islah al-Majisti (the corre! ction of the Almagest). He was of the perspective that the descend plan! ets Mercury and Venus), at least, contingency have manifest parallaxes. Venus may come about to be precisely on the line fasten the object and the earth. The most critical segment of his book is the foreword on trigonometry. The book was shortly translated in to Latin and Hebrew. Jbir Ibn Aflah is mentioned to be the contriver of the astronomical instrument called turquet (torquetum) which contains two graduated circles in two exact planes. The same innovation has moreover been ascribed to two other persons, namely, Frances of Leige (11th century) and Nsir al-Din Tusi (13th century). The turquet was introduced in to the Latin West by Regionomentus. It gained a great recognition in the 15th and 17th centuries. (28)
Another astronomer of the time was Abu'l Qsim Hibat Allah Ibn Husain al-Badi' al-Asturlbi. He was moreover a physician, mathematician, producer and litterateur. He was the paramount consultant of his time in the expertise and construction of astrola! bes; as a result his nickname al-Asturlbi. In 1120-30 astronomical observations were done beneath his direction, and astronomical tables were compiled. The observations were carried out in the palace of the Saljuq Sultan of Iran, Mughith al-Din Mahmud (1117-1131). The tables were dedicated to the Sultan, and were called after him the Mahmudic tables. Al-Asturlbi was very ample praised by Muslim biographers. He died in Baghdad in 1139-40. (29)
In the 13th century there flourished in the East a great academician of Persian origin, declared Abu Ja'far Muhammad Ibn Muhammad Ibn al-Hasan, Nsir al-Din al-Tusi al-Muhaqqiq, (the researcher). He was innate in Tus (Khurasan) in 1201, and died in Baghdad in 1274. He was a philosopher, mathematician, astronomer and physician. He was a of the paramount Muslim mathematicians and scientists. He wrote both in Arabic and Persian. It is mentioned that he knew Greek as well. He assimilated the Mongol service, and was after that! done director of the Waqf revenues.
While he was directo! r he resided at Maragha in Middle East Minor (1259-1274). Here he done astronomical observations in an look-out determined by the Mongol woman monarch Hulagu Khan II after he had degraded the final 'Abbasi Caliph, al-Mu'tasim, in 1258. A library was trustworthy to it. It is mentioned to have contained 4, 00,000 volumes which the Mongol armies had collected in Syria, Mesopotamia and Persia. Nsir al-Din was the first director of this observatory. He was take over by two of his sons.
Nsir al-Din was well proficient with the expertise of the Greeks. He wrote about 64 functions on many subjects. Here you shall, ponder only a few of his astronomical and astrological works. The most critical astronomical work of Nsir al-Din is the Tadhkirah fi 'Ilm al-Hay'ah (The description of astronomy) which is a precipitated outline of astronomy. To notify it many commentaries and super commentaries have been written. The work enjoyed ample popularity, it consists of 4 chapters. The secon! d chapter, alongside other things, contains engaging critique of the Ptolemy's Almagest in which he showed a great ingenuity. The critique customarily concerns the anomalies of the moon, and the suit in the embodiment of the planets (particularly Mercury and Venus) ; moreover the tender of a new network to reinstate the complicated Ptolemaic equipment of deferents and epicycles. His new and forceful critique of astronomy together with of other Muslim astronomers helped Copernicus in creation his reform'. Nsir al-Din wrote a dissertation on the 5 quadrants and two treatises on astrolabe. He moreover wrote two treatises on calendar.
Nsir al-Din done observations in the look-out at Maragha which was well equipped with great astronomical instruments. He prepared new astronomical tables called after the Mongol ruler, Al-Zij al-Ilkhni. Nasir al-Din asked the woman monarch to give him a time of 30 years to put together the tables, since it was the shortest time duri! ng which the solar cycles were completed. But the woman monarch refused! , and gave him only 12 years to accomplish this task. Nasir al-Din attempted a take over in completing the tables inside of this time. They were formed on new observations. But the use of the progressing ones had moreover been made.
The Zij-i- Ilkhni was originally written in Persian. It consists of 4 books dealing respectively with (a) Chinese, Greek, Arabic and Persian Chronology; (b) motions of the planets; (c) ephemeredes and (d) astrological operations. The interpretation of the Zij was done in to Arabic, and commentaries on it were written. Finally, a arrange of supplement to it was compiled by Jamshed Ibn Mas'd al-Kshi (d. 840/1436), the first director of Ulugh Beg's look-out in Samarqand. These tables enjoyed a great recognition in the East inclusive China, and were, one after another to be used even after the collection of new tables by Ulugh Beg in 1437. (30)
A ? la mode of Nasir al-Din, Mu'ayyid al-Din al-Urdi al-Dimashqi moreover took segment! with him in compiling the tables. He was a Syrian astronomer, designer and engineer. He started his vocation as a technician in Syria. He did a few hydraulic work in Damascus, and moreover constructed there an astronomical instrument for al-Mansr Ibrahim (King of Hims, 1239-1245). In about 1259 he went to Maragha, and helped Nasir al-Din in organizing the look-out and compiling the tables. It seems that the instruments, in few instances precise, were constructed beneath his supervision in the foundry trustworthy to the observatory.
Al-Urdi was the writer of a dissertation in which he moreover described the instruments used in the look-out of Maragha, and explained their use and construction. The instruments are as follows:-
(1) picture plot (2) armillary globe (3) solstitial armil (4) equinoctial armil (5) Hipparch's diopter (alidade); (6) instrument with two quadrants (7) instrument with two limbs (8) instruments to establish sines and azimuths (9) inst! ruments to establish sines and capable sines, (10) the perfect instrume! nt (a concept instrument) (11) parallactic woman monarch (after Ptolemy).
Al-Urdi was moreover the writer of two other treatises; a on the construction of a perfect globe and other on the integrity of the stretch between the centre of the object and the apogee. He compiled astronomical tables, and wrote on Ptolemaic astronomy.
In 1279 or 1289 al-Urdi's son Muhammad done a celestial globe. It consisted of two pewter hemispheres distant by the ecliptic. Its hole was 140 mm. It had a setting circle. Two mobile half circles were trustworthy to the culmination indicate by a pivot. These circles are graduated and are used to establish the slide and right ascent of any star. Forty-eight constellations, the equator and the ecliptic are inlaid with china or gold. It is preserved in the mathematical salon of Dresden. (31)
The functions of Muslim astronomers were after that translated in to Latin, Hebrew and vernaculars by the Christian and ! Jewish scholars, a few of the technical conditions inclusive azimuth (al-Samt), Algol (Alfol), Achernar (Akhir al-Nahr), transfered in to the European languages. The names of many stars such as akrab (Aqrab), Algedi (al-Jadi, the kid), Altair (al-ta'ir ,the player), Denab (dhanb, tail), Pherkad (Farqad, calf), Adara ('Adhrah) Aldebaran (al-dibrn), which are of Arabic origin, moreover transfered in to these languages. The stars being countless in number, their well-defined investigate is not possible. They were, therefore, widely separated in to assorted groups, and the groups were declared after the things and animals with which they resembled.
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