Back حبش الحاسب Arabic হাবাশ আল-হাসিব আল-মারওয়াজি Bengali/Bangla Habaix al-Hàssib Catalan حەبەش حاسیب مەروەزی CKB Habasch al-Hasib al-Marwazi German Habash al-Hasib al-Marwazi Spanish Habash al-Hasib al-Marwazi Basque حبش حاسب Persian Al-Marwazi French Habasy al-Hasib ID
Habash al-Hasib al-Marwazi (766 – d. after 869 in Samarra, modern Iraq[1]) was a Persian[2][3] astronomer,[4] geographer, and mathematician from Merv in Khorasan, who was the first to describe the trigonometric ratios tangent, and cotangent.
Habash flourished in Baghdad, and died a centenarian some time after 869. He worked under two Abbasid caliphs, al-Ma'mun and al-Mu'tasim.
Habash al-Hasib al-Marwazi | |
|---|---|
| Born | Habash al-Hasib al-Marwazi 766 AD Merv |
| Died | 869 AD Samarra |
| Nationality | Persian |
- ^ Charette 2007.
- ^ General Cartography Archived 2017-12-09 at the Wayback Machine : "The Iranian geographers Abū Muhammad al-Hasan al-Hamdānī and Habash al-Hasib al-Marwazi set the Prime Meridian of their maps at Ujjain, a center of Indian astronomy"
- ^ "Archived copy" (PDF). Archived from the original (PDF) on 2013-10-07. Retrieved 2013-09-04.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ Islamic Desk Reference, ed. E. J. Van Donzel, (Brill, 1994), 121.