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Time, Calendars, and Seasons

Calendars

What is the problem with a calendar based on the cycles of the moon

The time between two new moons is 29 and one half days. After 12 lunar months, a calendar based on the cycles of the moon falls short of a solar year—and thus the cycle of seasons—by 11.25 days. To compensate, the Hebrew Calendar, which is based on the moon cycle, has a regulated 19-year cycle in which an extra month is added every two or three years.



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