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The New Math of Easter
The Sabians of Haran survived for at least a couple hundred years by towing that party line. They may have survived into the 1000s or even the 1100s. But there's this period from about 400 AD until about 1000 AD when we can see that things collapse to a very low level. And then they're gradually rebuilding astronomical and astrological knowledge largely by importing it from Spain.