The Gregorian calendar is a solar calendar that was introduced by Pope Gregory XIII in October 1582 as a reform of the Julian calendar. It is used as an international standard for civil purposes. The Hebrew calendar is a lunisolar calendar that is used for Jewish religious purposes. It is based on the Metonic cycle of 19 years and has 12 months. The Hebrew calendar has a leap year that occurs seven times in a 19-year cycle.

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