Abstract
The only astronomical work by Abraham ben Yom Ṭov Yerushalmi is a set of instructions (or canons) in Hebrew for astronomical tables for which the tables are not extant. Abraham was active in Istanbul in the early sixteenth century and cited many previous authors of astronomical tables in Hebrew. The instructions include ways to use the tables for computing mean and true planetary positions as well as solar and lunar eclipses. According to a prayer book published in 1523, Abraham was familiar with the tables of Ulugh Beg (composed ca. 1440), originally in Persian, and translated into Arabic and Turkish. An anonymous Hebrew version of Ulugh Beg's tables is uniquely preserved in Paris, Bibliothèque nationale de France, MS Heb. 1091. It is noteworthy that Abraham's canons share some unusual technical terms with the Hebrew version.
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