Abu al-Wafa' Buzjani, Date of Birth, Place of Birth, Date of Death

Abu al-Wafa' Buzjani

Persian mathematician and astronomer

Date of Birth: 10-Jun-0940

Place of Birth: Buzhgan, Iran

Date of Death: 15-Jul-0998

Profession: scientist, astronomer, mathematician

Nationality: Iran

Zodiac Sign: Gemini

Abu al-Wafa?, Mu?ammad ibn Mu?ammad ibn Ya?ya ibn Isma?il ibn al-?Abbas al-Buzjani or Abu al-Wafa Buzhjani (Persian: ???????? ??????? or ????????) (10 June 940 – 15 July 998) was a Persian mathematician and astronomer who worked in Baghdad.
He made important innovations in spherical trigonometry, and his work on arithmetics for businessmen contains the first instance of using negative numbers in a medieval Islamic text. He is also credited with compiling the tables of sines and tangents at 15 ' intervals.
He also introduced the secant and cosecant functions, as well studied the interrelations between the six trigonometric lines associated with an arc.
His Almagest was widely read by medieval Arabic astronomers in the centuries after his death.
He is known to have written several other books that have not survived.