Commentary to Hilchos Kiddush HaChodesh of Maimonides by R. Shimon Waltch.
The laws concerning the new moon are amongst the most complex in Jewish law and require a thorough knowledge of both astronomy and mathematics.
Vinograd Berlin 344. Chevras Chinuch Na’orim press. 2, 10, 42 pages. 20 cm. With large fold out chart of diagrams. Fine condition some foxing. Modern binding.
Previous owner’s signature, and bookplates of R. Yaakov Weinberg, Rosh Yeshiva of Ner Yisroel Baltimore.