Chichén Itzá 2027: the serpent of light, dates and times

What happens

There is no line to hit: what counts is the angle of the light. It comes from 263° with the setting sun between 17.5° and 18.5° high, and the effect holds while it stays there.

Next dates

Local times at the site (America/Merida).

1. Saturday, 20 March 2027

   16:46 UTC−6

   Window 16–25 March · holds 10 days

2. Wednesday, 22 September 2027

   16:31 UTC−6

   Window 17–27 September · holds 11 days

3. Monday, 20 March 2028

   16:43 UTC−6

   Window 15–24 March · holds 10 days

4. Thursday, 21 September 2028

   16:30 UTC−6

   Window 16–26 September · holds 11 days

5. Tuesday, 20 March 2029

   16:44 UTC−6

   Window 15–25 March · holds 11 days

6. Friday, 21 September 2029

   16:29 UTC−6

   Window 17–26 September · holds 10 days

7. Wednesday, 20 March 2030

   16:45 UTC−6

   Window 15–25 March · holds 11 days

8. Sunday, 22 September 2030

   16:32 UTC−6

   Window 17–27 September · holds 11 days

Where to stand

Viewpoint: Lawn NW of El Castillo · El Castillo, Yucatán, Mexico
20.68380, -88.56950

Lined up with El Castillo, north balustrade, 0.12 km away. It works across an area around this point, not only from the exact spot.

Good to know

The lawn north-west of El Castillo; claim a spot around 14:30. INAH runs an equinox access plan with capped entries.

The effect lasts weeks and may not be intentional: a day or two either side looks almost the same. Sources give no façade azimuth: the window is fitted to the published dates (15–25 March).