Temple of Kukulcán marks equinox on 22 September
Published on 09/27/2026 at 13:15 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Temple of Kukulcán hosted the autumn equinox at Chichen Itza on 22 September 2026, when sunlight formed the celebrated serpent-shadow pattern on the pyramid. The monument, also called El Castillo by Spanish-speaking visitors, stood at the centre of an INAH visitor operation announced for the surrounding dates.
Temple of Kukulcán marked the equinox on 22 September
The autumn equinox took place at 6.06pm on 22 September, according to the Instituto Nacional de Antropología e Historia. INAH said the light-and-shadow phenomenon could be observed between 3pm and 4.30pm as the outline of a serpent appeared along the northern balustrade.
The special operation at the archaeological zone ran on 20 and 21 September. It was organised by INAH with the Cultur board of the Yucatán government and was intended to manage visitors, protect the heritage site and maintain orderly movement. The INAH equinox operation notice stated that tickets were available at the visitor centre and that the final entry during those two days was at 4pm.
From 4pm during the operation, access was restricted to the Great Ball Court, the Temple of the Thousand Columns, the Maya House, Cenote Xtoloc, the Ossuary and the Observatory. Chichen Viejo and the Great Museum of Chichen Itza were not accessible during the two special-operation days.
Temple of Kukulcán turns solar geometry into a visitor event
The pyramid rises 30 metres and has nine levels, four staircases and sides measuring 55.5 metres, figures published by INAH in its account of the monument's astronomical pattern. Sunlight reaches the north-western ramp, where triangular areas of light form the body of the descending serpent and lead towards the carved stone head at the foot of the staircase.
Newer observations describe the effect as part of a wider yearly cycle rather than a display limited to the equinox itself. INAH's research says seven light triangles frame the autumn equinox, with the number reducing afterwards until five triangles are reached on 9 October. The last brief glimmers on the balustrade are expected around 29 October, linking the September event to a longer period of changing illumination.
This relationship gives the 22 September event a particular connection with the architecture: the date was not merely a calendar marker, but the point at which a recurring solar pattern was expected to show seven triangles across the north-western ramp. The visitor arrangements reported by El Universal connected the phenomenon directly with access controls at the archaeological zone.
Visiting Temple of Kukulcán: what travellers from Western Europe should know
- The autumn equinox fell on 22 September 2026, with the official astronomical event at 6.06pm and the expected light-and-shadow viewing period between 3pm and 4.30pm.
- The related INAH operation took place on 20 and 21 September. During those dates, several courts, monuments, the Great Museum and Chichen Viejo had restricted or unavailable access.
- The monument is in the archaeological zone of Chichen Itza in Yucatán, Mexico. The special-operation notice identified the visitor centre as the place for entry tickets.
- The structure has four staircases and rises 30 metres, so the principal visual feature is viewed from ground level rather than by climbing the pyramid.
- Spanish is the official language of Mexico, and the national currency is the Mexican peso.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Temple of Kukulcán
When did the autumn equinox take place at Temple of Kukulcán?
The autumn equinox took place on 22 September 2026 at 6.06pm. The associated light-and-shadow effect was expected during the afternoon.
What happened at Temple of Kukulcán during the 2026 equinox?
Sunlight formed triangular patterns on the north-western balustrade, creating the appearance of a descending serpent. INAH applied visitor controls at the archaeological zone on 20 and 21 September.
Where is Temple of Kukulcán and how do visitors enter?
It is in the Chichen Itza archaeological zone in Yucatán, Mexico. The INAH notice identified the visitor centre as the location for entry tickets during the special operation.
