Coba jelasin Sumbangan dari Abu Ishaq Ibrahim Ibn Yahya Al-Zarqali dalam bahasa melayu dong

"Al Amal bi Assahifa Az-Zijia"

"Al Madkhal fi Ilm Annoujoum"

"Rissalat fi Tarikat Istikhdam as-Safiha al-Moushtarakah li Jamiâ al-ouroud"

E. S. Kennedy.  A Survey of Islamic Astronomical Tables, (Transactions of the American Philosophical Society, New Series, 46, 2.)  Philadelphia, 1956.