A lunar calendar is a calendar whose months record the cycles of the Moon's phases (synodic months, lunations). This in contrast to solar calendars, whose annual cycles are based on the solar year (which is about 11 to 12 days longer than twelve lunar months).
A lunar calendar is a calendar whose months record the cycles of the Moon's phases (synodic months, lunations). This in contrast to solar calendars, whose annual cycles are based on the solar year (which is about 11 to 12 days longer than twelve lunar months).
Source: Wikipedia "Lunar calendar" · CC BY-SA 4.0
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