Yaʿqub ibn Tariq

Ya ʿqūb ibn Tāriq was the astronomer most closely connected with al–Fāzarīin introducing the Zīj al–Sindhind to Islamic scientists; he seems, in fact, to have collaborated personally with the Indian astronomer who came to Baghdad with an embassy from Sind in 771 or 773. The most important of his works in this connection were Zīj mahlūl fī al–Sindhind li daraja daraja “Astronomical Tables in the Sindhind Resolved for Every Degree” Tarkīib al–aflāak “Composition of the Spheres” and Kitāb al–ʿilal (Boos of Causes”).

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