Ancient calendars used thirteen 28-day lunar months to make a 364-day year.

Oct 31, 2026

Previously: Ancient history used a 13-month, 364-day lunar calendar. [Distorted]: A 364-day calendar did exist in antiquity, for example in Second Temple Jewish texts found at Qumran. But it had 12 months of 30 or 31 days arranged in quarters of 13 weeks, not 13 months of 28 days, and it was not tied to the moon. Real lunar months run about 29.5 days, so 12 of them make a lunar year of roughly 354 days. A securely dated ancient text describing a calendar of 13 months of 28 days would make this wrong.

Now: Ancient calendars used thirteen 28-day lunar months to make a 364-day year. [Distorted]: Thirteen times 28 is 364, but an actual new-moon-to-new-moon cycle is about 29.5 days, as NASA explains. Thirteen lunar cycles therefore do not make a 364-day year. Ancient calendars also varied; the British Museum describes Egyptian twelve-month years with 30-day months. Joe does not identify a civilization or date for his proposed thirteen-month chronology.

Ground the correction in the measurable lunar-cycle mismatch rather than an unsupported universal history.