How Jewish Leap Years Came to Be Calculated

The method, developed by the Babylonians and kept alive by medieval Jews, is known in Hebrew as the “secret of impregnation.”

A detail from a medieval Hebrew calendar. Wikipedia.

A detail from a medieval Hebrew calendar. Wikipedia.

Observation
Sept. 28 2016
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Philologos, the renowned Jewish-language columnist, appears twice a month in Mosaic. Questions for him may be sent to his email address by clicking here.


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More about: Jewish calendar, Religion & Holidays, Rosh Hashanah