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tyco_brahe t1_j3i81im wrote

Reply to comment by WanderingAnchorite in Earliest evidence of the use of the Mesoamerican 260-day calendar, ‘centuries earlier than its previously known use in textual records,’ revealed by the orientations of newly-uncovered ruins along Mexico’s southern Gulf Coast by marketrent

This is really interesting, and I think you hit the nail on the head with the human gestation period.

It might not even be mal-nutrition. If you count from the first missed period, you get around 36 weeks / 9 months / 252 days. It's completely possible for the 260 days to be what they observed from the first indication of pregnancy (missed period) to birth and it doesn't require mal-nutrition or premature birth.

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