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HANNOVER, RAPHAEL LEVI. Sefer Tekhunat ha-Shamayim. Woodcut astronomical diagrams in text. [2], 38 leaves. 4to, old 1/2 cloth, diagonal crack across backstrip, rear hinge split; some headlines shaved, occasional marginal soiling, old stamps and inscription on title. Amsterdam; Jan Jansson, 1756
First edition of a short work on calendrical calculation and related astronomical topics from the standpoint of rabbinic law, written to clarify Maimonides' Hilkhot Kiddush ha-Hodesh, the portion of the Mishneh Torah dealing with the Jewish calendar. Though the latter work is based on Ptolemaic astronomy, Hannover's tract also includes a discussion and diagram of the Copernican system. EJ VII, 1275; Vinograd, Amsterdam 1742.
