Knowra Hebrew calendar Hebrew calendar The Hebrew calendar is a lunisolar calendar used in Judaism. Its months follow lunar cycles, while leap months keep the calendar aligned with the solar year.
Hebrew calendar month : A month in the Hebrew calendar, beginning near the new moon and lasting 29 or 30 days. Alternating 29- and 30-day months approximate the lunar cycle.
Lunar month : The interval between equivalent phases of the Moon, averaging about 29.53 days. Hebrew calendar months approximate this recurring lunar interval.
Jewish holidays : Annual religious and commemorative observances in Judaism, set by the Hebrew calendar. Their dates are determined by the calendar's months and year structure.
Hillel II : A fourth-century Jewish patriarch traditionally associated with establishing the fixed Hebrew calendar. His name is linked to the transition toward calendar dates that could be calculated in advance.
Islamic calendar : A lunar calendar of twelve months that does not add leap months to track the solar year. Unlike the Hebrew calendar, its months move through the seasons.
Hebrew calendar leap year : A Hebrew calendar year with an additional month, Adar I, inserted before Adar. The added month prevents lunar months from drifting through the seasons.
Synodic month : The average time between successive new moons, about 29.53 days. Its length explains why Hebrew months alternate between 29 and 30 days.
Passover : A Jewish festival commemorating the Exodus from Egypt, observed in the Hebrew month of Nisan. Its spring timing depends on intercalation keeping Nisan in the proper season.
Sanhedrin : The supreme Jewish council and court in ancient Israel, with authority over religious and legal matters. In the earlier system, its authorities proclaimed months after testimony about the new moon.
Gregorian calendar : The internationally predominant solar calendar, with leap days keeping its dates aligned with the tropical year. It tracks the solar year directly rather than coordinating lunar months with it.
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