[Treatises on the Calendar]
between 1570 and 1585
ink and pigment on paper, 90 leaves (15 x 9.5 cm.); Ashkenazi Rabbinic Hebrew script
Samuel Hillel Isaacs
This collection of treatises on the calendar begins with Abraham ibn Ezra’s brief Mikhtav shel Shabat, followed by calendrical equations for the year 1585 (leaves 1-6). That is followed by Sefer ʿevronot (ll. 7-95), which deals with calculating the leap year along with reckoning holidays, seasons, and their interpretation. In this manuscript it includes Mozne tsedeḳ (leaves 19-79) and a Luaḥ shel Notsrim (79-95). This section contains many charts and diagrams including a detailed diagram of an open globe (leaf 95r); a mutilated pull-out chart, in red, green, and yellow ink, tipped in between leaves 46 and 47); and paper wheels in red, green, and yellow ink on leaf 36 (recto and verso) and on leaf 45 (recto and verso). The collection concludes with Abraham bar Hiyya Savasorda’s Sefer ha-galgal (leaves 96-122).
The mark of an early previous owner indicates it may possibly have been produced in Worms (Germany).