David ben Meir Cohen Friesenhausen (1756–1828) was a German-Hungarian astronomer, maskil, mathematician, and rabbi.[1][2] Friesenhausen was one of the first proponents of Torah im Derech Eretz,[3][4] a philosophy of Orthodox Judaism that formalizes a relationship between traditionally observant Judaism and the modern world.[5] He proposed a dual curriculum of Jewish and secular studies for all rabbinic candidates,[3] a radically innovative idea at that time.[6] Friesenhausen wrote Mosedot Tebel and Kelil Heshbon. In the former, Friesenhausen writes in support of the Copernican heliocentrism, one of the first Jews to do so.[4]
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