Ali Ibn Isa

Ali Ibn Isa

Ali Ibn Isa ( _ar. علي بن عيسى) or Ali Ben Isa was an Arab astronomer, geographer and ophthalmologist in the 9th century.

He wrote the landmark textbook on ophthalmology in medieval Islam, "Notebook of the Oculists", for which he was known in medieval Europe as Jesu Occulist, with "Jesu" being a Latin translation of "Isa", the Arabic name for Jesus.

In Islamic astronomy and Islamic geography, together with Chalid Ben Abdulmelik in 827, he measured the Earth's circumference, getting a result of 40,248 km (or, according to other sources, 41,436 km).

See also

* List of Arab scientists and scholars


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