I'm not sure what the poll has to do with the OP, but I did look up Hebrew calendar in the index of my copy of BA, and sure enough on page 182, it's mentioned that the Hebrew calendar has been around for 5,800 years, and that is evidence that the lunar cycle has remained unchanged in that time. I'm no expert on the Hebrew calendar, but
this website says that the historical Hebrew calendar dates to AM4119, which is 359AD. The website says:
Quote:
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Prior to that time the calendar was regarded as a secret science of the religious authorities. The exact details of Hillel's calendar have not come down to us, but it is generally considered to include rules for intercalation over nineteen-year cycles. Up to the tenth century A.D., however, there was disagreement about the proper years for intercalation and the initial epoch for reckoning years.
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It goes on to say that the Hebrew calendar was greatly influenced by the Babylonian exile in the 6th century BC. So, the OP seems to be right, the structure of the Hebrew calendar as we know it today has probably only existed for 3000 years.