Beschreibung:

Two books on astronomy and arranging the calendars. Many illustrations and charts. With handwritten ownership signatures and glosses. · Sefer Ibronot, astronomy and new moons (molad). Offenbach, [1722]. Illustrated title page [headed by the solar system and constellations]. Inside the book are illustrations and wheels for calculating the new moons and the tekufot, and many charts. · Sefer Techunat Shamayim - Book describing heavenly bodies and their orbits. Matters related to astronomy and laws of blessing for the New Moon, including illustrations and diagrams. By Rabbi Raphael HaLevi of Hannover. Amsterdam, [1756]. Volume containing both books: [2], 40 leaves; [2], 38 leaves (without the 2 leaves of Kuntress Acharon which exists in some copies). 18 cm. Fair condition. Stains and wear, tears with ancient paper-restorations. Handwritten ownership signatures. (Cutoff) glosses. Worn and detached binding.