Abu'l Hasan Thabit ibn Qurra' ibn Marwan al-Sabi al-Harrani, (826 – February 18, 901) was an Arab astronomer and mathematician. In Latin he was known as Thebit. Events The Danish king accepts Christianity. ... February 18 is the 49th day of the year in the Gregorian Calendar. ... Events Mesoamerican ballgame court dedicated at Uxmal Kingdom of Taebong established in Korean peninsula Fuzhou city was expanded with construction of a new city wall (Luo City). Births Deaths February 18 - Thabit ibn Qurra, Arab astronomer and mathematician Categories: 901 ... The Arabs (Arabic: عرب Ê»arab) are a large ethnic group widespread in the Middle East and North Africa, originating in the Arabian Peninsula of southwest Asia. ... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ... This article is in need of attention from an expert on the subject. ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ...

Thabit was born in Harran (antique Carrhae), Mesopotamia (now Turkey). At the invitation of Muhammad ibn Musa ibn Shakir, one of the Banu Musa brothers, Thabit went to study in Baghdad at the House of Wisdom. He belonged to the sect of the Harranian Sabians, often confused with the Mandaeans. As star-worshippers, Sabians showed a great interest in astronomy and mathematics. This sect lived in the vicinity of the main center of the Caliphate until 1258, when the Mongols destroyed their last shrine. During Muslim rule, they were a protected minority, and around the time of al-Mutawakkil's reign their town became a center for philosophical, esoteric and medical learning. They were joined by the descendants of pagan Greek scholars who, having been persecuted in Europe, settled in lands that became part of the Abbasid caliphate. The Muslims were greatly interested in Greek culture and science, collecting and translating many ancient Greek works in the fields of philosophy and mathematics. Although they later became Arabic speakers, in pre-Islamic times, it was common for Sabians to speak Greek. Ruins of the Ulu Cami (Great Mosque) at Harran Harran, also known as Carrhae, is an archeological site in present day southeastern Turkey, 24 miles (39 kilometers) southeast of Sanli Urfa. ... Sumerian list of gods in cuneiform script, ca. ... Jafar Muhammad ibn Musa ibn Shakir Banu Musa, also Bani Musa, (800 - 873), was a 9th century Persian mathematician and astronomer from Baghdad, the eldest of the Banu Musa brothers. ... al-Hasan ibn Musa ibn Shakir Banu Musa, also Bani Musa, (810 - 873), was a 9th century Persian mathematician and astronomer residing in Baghdad. ... Average temperature (red) and precipitations (blue) in Baghdad Baghdad (Arabic: ) is the capital of Iraq and of Baghdad Province. ... The House of Wisdom (Bayt al-Hikma) was a institution for education and research founded by the caliph al-Mamun. ... Ruins of the Ulu Cami (Great Mosque) at Harran Harran, also known as Carrhae, is an archeological site in present day southeastern Turkey, 24 miles (39 kilometers) southeast of Sanli Urfa. ... Sabian is a term that has been more or less inaccurately used to describe at least 3 religious groups (see Mandaeanism, Harranians or Sabeans, and Sabaeans). ... Mandaeanism is a pre-Christian religion which has been classified by scholars as Gnostic. ... Astrology: the study of the positions of the celestial objects relative to the Earth and how these positions affect happenings on the lives of cultures, nations and the natural environment. ... Mathematics is often defined as the study of topics such as quantity, structure, space, and change. ... For broader historical context, see 1250s and 13th century. ... Honorary guard of Mongolia. ... A Muslim (Arabic: مسلم) (sometimes also spelled Moslem) is an adherent of Islam. ... Al-Mutawakkil Ala Allah Jafar bin al-Mutasim (821–861) (Arabic: المتوكل على الله جعفر بن المعتصم) was an Abbasid caliph who reigned (in Samarra) from 847 until 861. ... Abbasid provinces during the caliphate of Harun al-Rashid Abbasid (Arabic: العبّاسيّون AbbāsÄ«yÅ«n) was the dynastic name generally given to the caliphs of Baghdad, the second of the two great Sunni dynasties of the Islamic empire, that overthrew the Umayyad caliphs. ... An Anglicized/Latinized version of the Arabic word خليفة or Khalīfah, Caliph (  listen?) is the term or title for the Islamic leader of the Ummah, or community of Islam. ... For the scientific journal named Science, see Science (journal). ...

Thabit and his pupils lived in the midst of the most intellectually vibrant, and probably the largest, city of the time, Baghdad. He occupied himself with mathematics, astronomy, mechanics, medicine and philosophy. His native language was Syriac, which was the eastern Aramaic dialect from Edessa, and he knew Greek well too. He translated from Greek Apollonius, Archimedes, Euclid and Ptolemy. Thabit had revised translation of Euclid Elements of Hunayn ibn Ishaq. He had also rewritten Hunayn's translation of Ptolemy's Almagest and translated Ptolemy's Geography, which later became very well-known. Thabit's translation of a work by Archimedes which gave a construction of a regular heptagon was discovered in the 20th century, the original having been lost. Mechanics refers to: a craft relating to machinery (from the Latin mechanicus, from the Greek mechanikos, meaning one skilled in machines), or a range of disciplines in science and engineering. ... Medicine on the Web NLM (National Library of Medicine, contains resources for patients and healthcare professionals) Virtual Hospital (digital health sciences library by the University of Iowa) Online Medical Information- medical news, links and resources Collection of links to free medical resources Category: ... These five broad types of question are called analytical or logical, epistemological, ethical, metaphysical, and aesthetic respectively. ... Syriac is an Eastern Aramaic language that was once spoken across much of the Fertile Crescent. ... Aramaic is a Semitic language with a 3,000-year history. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Apollonius may be: Historical people: Apollonius (philosopher), Greek philosopher is Apollonius of Tyana listed below. ... Archimedes of Syracuse. ... Euclid Euclid of Alexandria (Greek: ) (ca. ... Claudius Ptolemaeus, given contemporary German styling, in a 16th century engraved book frontispiece. ... Almagest is the Latin form of the Arabic name (al-kitabu-l-mijisti, i. ... A heptagon is a plane figure with seven sides and seven angles. ...

Later in his life, Thabit's patron was the Abbasid Caliph al-Mu'tadid (reigned 892–902). Thabit became the Caliph's personal friend and courtier. Only a few of Thabit's works are preserved in their original form. Al-Mutadid (d. ... Events Poppo of Thuringia, count of the march in Thuringia,is deposed by the German Carolingian king Arnulf of Carinthia Arnulf of Carinthia invades Great Moravia Duke Guido of Spoleto crowned Roman Emperor in April The former Silla general Gyeonhwon attacks the city of Gwangju and declares himself king. ... Events Births Deaths Categories: 902 ...

According to Copernicus Thabit determined the length of the sidereal year 365 days, 6 hours, 9 minutes and 12 seconds (an error of 2 seconds). He published his observations of the Sun. In mathematics Thabit discovered an equation for determining the amicable numbers. Nicolaus Copernicus (Mikołaj Kopernik) Mikołaj Kopernik (February 19, 1473 – May 24, 1543), more commonly known by the Latin form Nicolaus Copernicus, was a Polish[1] astronomer, astrologer, mathematician, administrator and economist. ... The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere. ... The Sun (or Sol) is the star at the center of our Solar system. ... Amicable numbers are two numbers so related that the sum of the proper divisors of the one is equal to the other, unity being considered as a proper divisor but not the number itself. ...

He also wrote on the theory of numbers, and extended their use to describe the ratios between geometrical quantities, a step which The Greeks never took. This article needs to be cleaned up to conform to a higher standard of quality. ...

Thabit died in Baghdad. After him the greatest Sabean name was Abu Abdallah Mohammad ibn Jabir Al-Battani. Thabit and his grandson Ibrahim ibn Sinan ibn Thabit studied the curves needed for making sundials. Thabit's son Sinan ibn Thabit was a distinguished physician who was responsible for supervising all the public hospitals of Baghdad. Al Battani (ca. ... Wall sundial Wall sundial in Warsaws Old Town A sundial measures time by the position of the sun. ...

External links

• http://www.renaissanceastrology.com/thabit.html Thabit Ibn Qurra on Astrology & Magic