Sanad ibn ʿAli

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Sanad bin Ali Al-Yahoudi who was known as Al-Ma’moun’s Astronomer (Munajjim Ma’mouni), and to Yahya bin Abi Mansour, and Khalid bin Abdil Malak. As a result of his observations and those of his colleagues, Sanad wrote a well-known Zeej or an ephemeris (which is a table of the calculated positions of a celestial object at regular intervals throughout a period). It is said that Sanad became a Muslim at the hands of Al-Ma’moun himself. (MJ & AS, p. 130).