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Calendars have been used for thousands of years. The early ones were usually based on the phases of the Moon and the movement of the Sun. We still depend largely on the natural movements of the Earth, Moon and Sun to divide up time.

The calendar we use today is based on the Julian calendar, which was introduced by the Romans in 46bc. It had 365 days, and the Romans had not yet discovered the need for leap years. By 1582 the Julian calendar was ten days out, and Pope Gregory decreed that ten read more...

Tags: calendars, earth

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