Why it matters
At the equinox the stepped pyramid of Kukulcán throws a shadow-serpent down its stairway. Calendar, astronomy and myth, built into stone.
What mainstream says
An accepted Maya-Toltec city; the equinox shadow is real and intentional.
Graded Grounded · A on the Ancient Code honesty scale (A grounded · C contested · S speculation · U unidentified). It belongs to the The sky line of evidence.
Sources & further reading
The authoritative reference for this site/finding — and its own primary citations — so you can check us.