موسوعة العلمـاء و المخترعين .. العلمـاء بالترتيب حسب اسم الشهرة .. الحرف ح

Encyclopedia of Scientists and Inventors.. Scientists in order according to their nickname.. The letter H

Al-Hasib al-Karkhi, Fakhr al-Din Muhammad ibn al-Hasan
al-Hasib al-Karkhi , F.M.

Islamic mathematician (? - between 1019 and 1029) ·
The upbringing of Abu Bakr Fakhr al-Din al-Karkhi computer Della Vida is unknown, and the orientalist Dalla Ghida believes that the surname of this athlete is al-Karji and not al-Karkhi, relative to the al-Karkh district in Baghdad.
The Karkhi computer was not inclined to use numbers, but rather it used to prove the numbers written in letters in the Greek manner in its works.
He relied on the writings of Al-Khwarizmi, especially in algebra, but he added to it in equations and many proofs, whether in solutions or in the degrees of Al-Karkhi’s computer books. more complex equations.

⏹ Al-Harani, Ibrahim bin Sinan bin Thabit bin Qurra
Al-Harrani Ibrahim

Arab scientist, physician and engineer 908-946
He is the grandson of the physician and scientist, Thabit bin Qurra, originally from Harran, and he was a Sabean, born and died in Baghdad. He had good contributions in astronomy, whether from his production or by transferring it from Greece. Among his books are The Objectives of the Almagest, The Instruments of Shadows, A Treatise on the Astrolabe, and An Essay on Drawing the Three Pieces. The last two books are in print.
Al-Harani had a prominent interest in physics, especially in light, which Ibn Al-Haytham took from him. And he had correct observations about the inflection, refraction and the properties of rays.

⏹ Al-Hassan Al-Marrakshi, Abu Ali Al-Hassan bin Ali bin Omar
Hassan al-Marrakishi al

Islamic mathematician, astronomer and geographer (thirteenth century AD)
The fame of Al-Hassan Al-Marrakshi is based in the first place on his prowess in mathematics, and his most famous books are Principles and Goals in the Science of Time.
The book contains a lot of information related to observational instruments and methods, and it contains a table of two hundred and forty stars that were observed by Al-Hasan Al-Marrakshi around the year 1220.