![]() It’s a refinement of the Julian calendar, proposed by Julius Caesar in 46 BC, which improved upon to the Egyptian solar calendar that already divided the solar year into 365 days. The calendar we use today is the Gregorian Solar Calendar, which Pope Gregory XIII introduced in 1582. To compensate, a 13th moon has to be added to the lunar year at regular periods. For that reason, the lunar calendar goes out of sync with the seasons it’s supposed to mark. ![]() Earth’s seasons are linked to the solar year, which is longer than 12 full moons. Each lunar cycle is 29.5 days long, a constant and handy time unit that’s easier to use than individual days for tracking seasonal events, such as the length of summer or harvest and hunting times.īut the lunar calendar has its limitations. ![]() The lunar cycle - the period of time between one full Moon and the next - has been a common timekeeping device for human beings across the world. Houssem Ksontini / S&T Online Photo Gallery
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