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Al Battani

Al-Battani (ca. 855 - 923 ) was an astronomer and mathematician Arabic (also written as Al Batani, and Latin: Albategnius, Albategni, Albatenius; full name born in Harran near Urfa in Turkey. His epithet as-Sabi suggests that his ancestors were members of the sect of Sabians who worshiped the stars, but his full name said he was Muslim. It is sometimes referred to as " Ptolemy of the Arabs. "

Al-Battani worked in Syria , in Ar-Raqqa and Damascus where he died.

His major work, the Kitab az-Zij (the "Book of Tables") composed of 57 chapters, translated into Latin as De Motu stellarum by Plato of Tivoli (Plato Tiburtinus) in 1116 (printed 1537 by Melanchthon , annotated by Regiomontanus ), has significantly influenced the astronomy in Europe. A new edition appeared at Bologna in 1645. Plato's original manuscript is kept in the Vatican library. The Escorial Library possesses a manuscript of astronomical chronology of al-Battani.

Astronomy

He corrected some calculations of Ptolemy and produced new tables for the Sun and the Moon , which have long considered authoritative. He also discussed the division of the celestial sphere. He discovered the movement of the apogee of the Sun, calculated values of the precession of the equinoxes (54.5 "per year) and the tilt of the Earth's axis (23 35 ').

Mathematics

Probably without knowing the work of the astronomer India 's ^fifth century Aryabhata , he introduced the use of sines in calculation, and partly that of the tangent , thus forming the basis for trigonometry modern.

He used the ideas of al-Marwazi on tangents (or "shadows") to develop methods for calculating tangents and cotangent, and he has compiled tables.

He created several trigonometric formulas:

$\ Tan a = \ frac {\ sin} {\ cos A}$

$\ LP = \ sqrt {1 + \ tan ^ 2}$

He also solved the equation

$\ Sin x = a \ cos x \,$

by translating by the following equation:

$\ Sin x = \ frac {a} {\ sqrt {1 + a ^ 2}}$

The great figures of medieval Islam
Abu Kamil Ibn al-Baitar Abu Nuwas Al-Battani Al-Jazari Al-Maari Abu Midian Abdeslam Ben Mchich Shadhili Ahmad ibn Idris Al-Bakri Al-Biruni Taqi al-Din Alhazen Al-Kashi Al-Kindi Averroes Avicenna Al Idrissi Abbas Ibn Firnas Al-Marwazi Ibn al-Nadim Ibn Khaldun Ibrahim ibn Sinan Jabir Ibn Hayyan Hassan al-Wazzan Omar Khayyam Ibn al Khatib Al Maqqari Al-Khwarizmi Ibn Fadlan Ibn Nafis Abu Al-Qasim Ali Quchtchi Al-Soufi Ibn Battuta Al-Hallaj Al-Razi Qadi-zadeh Roumi Nasir ad-Din at- Tusi Aboul-Wafa Sinan Tabari Al-Farabi Al-Ghazali Ibn Arabi Jalal Ud Din Rumi Ibn Taymiyyah Farid al-Din Attar Saadi Avenpace Ibn Tufayl Ibn Hazm

The great figures of medieval Islam