The serpent shadow, the practical version
Chichén Itzá's equinox serpent is on the 22nd of September. I wrote the version you actually need if you are going, or watching from a screen: what time the shadow forms, why “equinox day” is shaky advice, and the honest caveat that INAH publishes dates but not hours.
The serpent shadow at Chichén Itzá: when to watch, September 2026
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