Raphael Halevi of Hannover. Techunath HaShamayim [calculations of intercalation and the Jewish calendar]. Edited by Moshes ben Jekuthiel of Tiktin.

A guide to the scientific aspects of Maimonides’ Hilchoth Kiddush HaChodesh (Laws of Sanctification of the New Moon). The author was an interesting amalgam of two worlds: He excelled in his traditional yeshivah education in Frankfurt a/Main, yet was also closely associated with the philosopher Gottfried Wilhelm Leibniz. See S. Feiner, The Jewish Enlightenment (2004) pp. 41-42.