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IntersectionThématiqueIVe siècle–Moyen Âge

The Calculation of the Molad and the Rules of the Hebrew Calendar

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חשבון המולד וכללי הלוח העברי

Region: Babylonie, Terre d'Israël

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The luni-solar Hebrew calendar relies on the calculation of the molad (mean lunar conjunction) and a nineteen-year (Metonic) cycle with seven leap years. Tradition attributes its fixing to Hillel II in the fourth century. Precise postponement rules (dehiyot) determine the New Year and align festivals with the lunar phases.

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