lunar calendar
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April 12, 2025
A lunar calendar is a calendar system based on the cycles of the Moon rather than the Sun. Each month begins with a new moon and lasts about 29.5 days, making a lunar year roughly 354 days—about 11 days shorter than a solar year.
This is why holidays like Chinese New Year, Ramadan, and Easter fall on different dates each year. The Islamic calendar is purely lunar. The Chinese and Hebrew calendars are lunisolar—they use moon cycles but add an extra month periodically to stay aligned with the seasons.
The most spectacular celebration tied to the lunar calendar is Chinese New Year, with its fireworks and dragon dances. Before clocks and apps, the moon was how most of humanity kept time.
This is why holidays like Chinese New Year, Ramadan, and Easter fall on different dates each year. The Islamic calendar is purely lunar. The Chinese and Hebrew calendars are lunisolar—they use moon cycles but add an extra month periodically to stay aligned with the seasons.
The most spectacular celebration tied to the lunar calendar is Chinese New Year, with its fireworks and dragon dances. Before clocks and apps, the moon was how most of humanity kept time.
Rate of Appearance in English Language Print
Google's Ngram project shows how often a pair of words has appeared in print every year since the 1800's.
Data from Google Books Ngram Viewer. Licensed under CC BY 3.0.
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