Hazen

(Alhazen),
romanized. of Abu Ali Muhammad ibn al-Hasan ibn al-Haytham
(965, Basra, now in the territory. Iraq - 1039, Cairo, Egypt)
Most of his life in Cairo. A. became widely known, had a great influence on the development of science (especially optics), as in the Arab world and in Europe. However, in the life of a. not all evolved safely. Unsuccessful were his relations with the caliph al-Hakim, a mental disorder. Once A. rashly said that he is able to regulate the flooding of the Nile, and then was forced to feign madness (to avoid a penalty) until the death of the Caliph in 1021, Mr..

A. wrote about 100 works. He is the author of thorough and accurate compilation of works on astrology. Called the second Ptolemy. Calculating the angle of the sun dipping below the horizon in the early morning twilight, determined the height of the earth's atmosphere at 52 thousand steps. Supplemented Ptolemy, in making astronomical observations on the refraction correction. In Europe, the era of the late Middle Ages was known for a number of astrological works. in Latin. Transfers (in t.ch. "De aspectibus" - "On Aspects").