Lunar Calendar

A Lunar Calendar is a calendar based primarily on the phases of the Moon. It measures time by the cycles of the Moon’s phases—new moon to new moon—resulting in months that typically last 29 or 30 days. This leads to a lunar year containing approximately 354 days, which is shorter than the solar year of about 365 days. Consequently, lunar calendars often drift relative to the seasons unless adjusted with periodic intercalary months or days. Various cultures, such as Chinese, Islamic, and Hebrew societies, use lunar calendars to dictate religious observances, agricultural activities, and civil events. Each of these lunar calendars may have its unique system of months and their names, varying practices, and occasional intercalation to reconcile the lunar and solar years.