?ass?n ibn ?ass?n

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?ASS?N IBN ?ASS?N

?ASS?N IBN ?ASS?N (second half of tenth century), Spanish astronomer, who was called by some ?ass?n ibn Mar ?ass?n and by others Ali ibn Mar ?ass?n It seems that ?ass?n was not his father's personal name but his family name. ?ass?n was a dayyan in Cordoba. That he lived in the tenth century can be inferred from the date 972 c.e., which he used in his calculations. He was an astronomer who followed the system of al-Batt?n?, writing three works which were in the possession of Jewish astronomers in *Spain and in Eastern countries during the Middle Ages but were later lost.

bibliography:

Ashtor, Korot, 1 (19662), 197, 297.

[Eliyahu Ashtor]

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