El Castillo, the Kukulcán pyramid at Chichén Itzá, produces a serpent-like shadow on its north staircase around the equinoxes. The shadow builds before sunset, while the sharply defined serpent is brief; equinox crowds grew from about 200 to 60,000. Four 91-step stairways plus the top make the familiar 365-step count. The pyramid has nine terraces—not 18—and 52 panels tied to the Maya Calendar Round. Built by the Maya with strong Toltec influence, it embodies Maya cosmology. The video also argues that a full Moon at an equinox can create the same effect.
El Castillo at Chichén Itzá produces the equinox serpent-shadow illusion
MexicoArchaeoastronomy
Site mentioned
Key facts
- El Castillo, the Temple of Kukulcán, stands at Chichén Itzá in Yucatán, Mexico.
- Around the equinoxes, sunlight creates a serpent-like shadow on the north stairway. It builds before sunset, while the sharply defined serpent is brief and timing varies by date.
- Documented equinox attendance grew from roughly 200 people to around 60,000 over 12 years.
- The familiar 365-step count comprises 91 steps on each of four stairways plus the top platform and is commonly linked to the solar year.
- El Castillo has nine stepped terraces or platforms, not 18. The 18-month figure belongs to the Maya Haab calendar, not the pyramid's architecture.
- Its 52 carved panels are commonly associated with the 52-year Calendar Round.
- The four sides align with the cardinal directions; the four-seasons reading is a popular interpretation of its cosmological symbolism.
- El Castillo was built by the Maya and shows strong Toltec influence in its architecture and religious imagery.
- The video argues that a full Moon at an equinox can create the same serpent-shadow effect as the Sun. The Moon's annual path is offset from the Sun's rather than identical.
Sources
megalithomania.co.uk
Linked in video description
"Serpent of Light and Shadow" Phenomenon at the Castillo ...academia.edu
The study investigates the 'Serpent of Light and Shadow' phenomenon at Chichén Itzá. Pilgrimage practices related to equinox events reflect cultural ...
El Castillo Equinox Stock Photosgettyimages.com
People gather to watch as the shape of a serpent is cast in shadows on the El Castillo pyramid in Chichen Itza, Yucatan state, Mexico, on the day of...
The Feathered Serpent and the Equinoxlettersfromwanderer.substack.com
It is the story of how my family saw the shadow of the mythical feathered serpent, Kukulcan, descending the stairs of the Castillo of Chichen ...
The descent of the serpent in the Chichen Itza Equinoxmayanpeninsula.com
The effect lasts a few minutes and is made when the sun casts the shadow onto the stairway created by the 9 platforms resembling the body of the serpent that ...
Chichen Itza Equinox 2026: Serpent Shadow Datestourtochichenitza.com
The serpent shadow on El Castillo builds gradually over roughly two and a half hours before sunset, becoming more defined as the light angle sharpens. Many ...
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