Bidspirit auction | Classics. Sefer Ibronos. Including the

Classics. Sefer Ibronos. Including the Rare Attachments. Complete Copy Including all the Volvelles. Offenbach 1722 - Fascinating work on astronomy and calculations of intercalation of the Jewish calendar, by R. Eliezer Beilin. The Jewish calendar is Lunisolar; the months are reckoned by the moon and the year by the sun. The knowledge required to make the necessary adjustments has always commanded an interest in astronomy for religious Jews, particularly those with brilliant minds. The RaMBaM devotes an entire section of his Mishnah Torah to what he lists as a positive commandment “to know how to determine which is the first day of each month of the year.” The Sefer Ibronos was prepared by R. Beilin as a manual “to help an individual fulfill the commandments.” This edition is particularly beautiful with fine illustrations and volvelles for calculations. Stefansky classics (511) Vinograd Offenbach 63. Yisroel ben Moshe press. [2], 40 pages. 19 cm. Fine condition. Some wear, slightly affecting text. Some pages loose. Opening bid $1500