Ibn Yunus

Ibn Yunus ( full name أبو سعد عبد الرحمن بن يونس الصدفي المصري / Abū Sa ʿ d ʿ Abd al-Rahman b Yūnus aṣ - Ṣadafī al - Misri, . C. 951 in Fustat, Cairo, † May 31, 1009 ) was an Egyptian astronomer and mathematician.

His father was a historian, biographer and scholar of hadith ( traditions about Muhammad ).

His early life and his education are unknown. Previously, the Fatimid dynasty had come to power, over 26 years worked for the Ibn Yunus as an astronomer, first for the Caliph al - Aziz Al- Haakim and then for.

According to our own observations he made the big Hakimitischen planetary tables (named after the caliph ) on. The Gnomon as an astronomical observation instrument he improved. He determined the obliquity of the ecliptic and the precession. He also wrote a representation of trigonometry. His observatory was part of the House of Wisdom in Cairo, and was from 1005 until the end of the Fatimids in 1171 in use. According to him, a lunar crater in the Mare Marginis is named.

Works

• Az- Zidsch al -Kabeer al -Hakim
• Kitab al - bulugh umniyya