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Al Marwazi

Ahmad ibn 'Abdallah al-Habash al-Hasib Marwazi was an astronomer Persian probably born in Merv in Khorasan in Persia , around the year 770 (he died in the centenary year 870 ) and who worked mainly in Baghdad during the reigns caliphs al-Mamun and al-Mutasim where he made observations in the period 825 - 835.

He is mostly a compilation of three major astronomical tables:

The first was established in the manner of Hindu astronomers.
The second called "Table Test" is the most important. It was composed mainly of documents from "Arab" and there is every reason to believe that it is actually shaping of a collective effort of all astronomers working at the time in Baghdad.
The third, much smaller, is called "Table of the Shah."

During the eclipse of the Sun in 829 , al-Marwasi proposed a measure of the duration of the phenomenon based on the elevation of the sun above the horizon , a method adopted by the following most Arab astronomers.

He also introduced the concept of "shadow" which could correspond to our modern notion of tangent and he set up a table such "shadows." It was the first to work well.

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