Babylonian Calendar

The Babylonian calendar was an ancient timekeeping system based on lunar months, roughly aligned with the cycles of the Moon. It consisted of 12 months, each lasting about 29 or 30 days, totaling approximately 354 days annually, which is about 11 days shorter than a solar year. To keep the calendar aligned with the seasons, Babylonians occasionally added an extra month, known as an intercalary month. This system helped them plan agriculture, religious festivals, and civic activities. The Babylonian calendar significantly influenced later calendars, including the Hebrew and, indirectly, the Gregorian calendar.