Chichen Itza El Castillo Pyramid
800–1200 CE
El Castillo's 365 steps encode the solar calendar, its equinox serpent shadow descends for exactly 3 hours, and its staircase produces an acoustic echo that mimics the call of the sacred quetzal bird.
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Mayan Dresden Codex
1200–1250 CE (copy of older text)
The Dresden Codex contains Venus tables accurate to within 2 hours over 481 years — proof that Maya astronomers tracked planetary cycles with a precision that rivals modern calculations.
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