The lunar calendar, an ancient timekeeping system, is based on the phases of the Moon as it orbits the Earth. Unlike the more common solar calendar, which is synchronized with the Earth's orbit around the Sun, the lunar calendar is determined by the Moon's cycles.
A lunar month, or synodic month, is approximately 29.5 days long, during which the Moon goes through distinct phases: new moon, first quarter, full moon, and last quarter. Many cultures across the globe have historically used lunar calendars for religious, agricultural, and societal purposes.
The Islamic calendar, for example, is a lunar calendar used by Muslims to determine the dates of important religious events like Ramadan. Additionally, traditional East Asian calendars, such as the Chinese and Korean calendars, are also lunar-based and are often utilized alongside the solar-based Gregorian calendar for various cultural celebrations and festivals.
While the lunar calendar is not as widely adopted for day-to-day activities today, its historical significance and cultural importance endure in diverse communities worldwide.
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