How Jewish Leap Years Came to Be Calculated https://mosaicmagazine.com/observation/religion-holidays/2016/09/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.”

September 28, 2016 | Philologos
About the author: 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.

A detail from a medieval Hebrew calendar. Wikipedia.

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