Na saite Astrometriya Astronomicheskie instrumenty Astronomicheskoe obrazovanie Astrofizika Istoriya astronomii Kosmonavtika, issledovanie kosmosa Lyubitel'skaya astronomiya Planety i Solnechnaya sistema Solnce

Polnoe imya: Abu-l-Hasan Ali ibn Abi Said, Abd ar-Rahman ibn Ahmad ibn Yunis as-Sadafi.

Egipetskii astronom. Provodil obshirnye astronomicheskie nablyudeniya v observatorii na gore Mokattam bliz Kaira (postroena v 1000). Sostavil astronomicheskie i trigonometricheskie (tak nazyvaemye hakemitskie) tablicy, otnosyashiesya k dvizheniyu Luny, Solnca i planet. Eto byli luchshie tablicy takogo roda, oni primenyalis' v praktike astronomicheskih vychislenii okolo dvuh stoletii. Pomimo sobstvennyh nablyudenii opublikoval takzhe obzor nablyudenii drugih arabskih astronomov za 200 let. Na osnovanii analiza Dannyh nablyudenii zatmenii Solnca i Luny s 977 po 1007 otkryl vekovoe uskorenie srednego dvizheniya Luny. Usovershenstvoval gnomon i dokazal, chto ego ten' pokazyvaet vysotu nad gorizontom verhnego kraya (a ne centra) solnechnogo diska.

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