Bidspirit auction | Sefer Ha’Ibur, London 1851. First

Sefer Ha’Ibur, London 1851. First Edition - A comprehensive work authored by R. Avraham bar Chiyah HaNasi (c. 1070-1136), published for the first time from manuscript, held in The Bodleian Library at Oxford. According to some scholars, the author was a disciple of R. Avraham Ibn Ezra.  The oldest-known work dealing with the calculation of the Hebrew calendar.  122 pp.