What you'll see
According to an article in Arqueología Mexicana shared by Mexico's INAH, the light-and-shadow figure appears on El Castillo's northwest balustrade and visually ends at the stone serpent head at the foot of the pyramid. It's popularly called the descent of Kukulkán, the feathered serpent.
What the research says
Researchers have documented this lighting pattern at various times of year, not only on the equinoxes. So it's misleading to present it as something that happens only on March 21 or September 22.
The link between the lighting and Mesoamerican calendars is a subject of archaeoastronomical research: an academic interpretation, not a settled fact.
What depends on the day
How well the serpent shows depends on the sun's position and the sky: clouds wipe it out. And on equinox dates, crowds are usually very large.
Tips for an equinox visit
- Arrive as early as possible and expect crowds.
- Water, a hat and sun protection: the wait is outdoors.
- Check INAH's hours and access conditions for those dates.
- Consider going a few days before or after: the pattern is visible around those dates too.
Getting to Chichén Itzá from Mérida
For the equinox, book well ahead: demand is high. Mary Tours offers two guided options: the Chichén Itzá, Izamal, Selva Maya cenote and Valladolid trip by van, and Maya Train, Chichén Itzá and magical town, which rides the train to Izamal. If you'd rather go on your own, there's a private transfer to Chichén Itzá. The office is at Calle 61 #518-B in Mérida's historic center; schedules and prices are in the booking section.
Fun facts
- The serpent of light ends at a carved stone serpent head.
- The effect isn't limited to the exact day of the equinox.
- Under cloudy skies, the serpent doesn't appear.
Related tours
Archaeology · 11 h
Chichén Itzá, Izamal and Valladolid
Four stops in one day, and none of them rushed
from $1,200 MXN per person
See itinerary
8:00 AM – 8:00 PM · daily
- 8:00 AM Departure from the office — An hour on the road to Izamal. The guide uses the drive to set up what comes next.
- 9:00 AM San Antonio de Padua Convent — The story of the 16th-century Franciscan convent told in its atrium, then free time to walk the yellow town.
- 11:15 AM Chichén Itzá — Guided walk through the Temple of Kukulkán, the Sacred Cenote, the Ball Court, the Tzompantli and the Jaguars and Eagles platform.
- 1:45 PM Regional lunch in Kaua — Buffet of Yucatecan dishes: cochinita, relleno negro, lime soup and meat-free options.
- 3:00 PM Selva Maya cenote — The swim lands exactly when the sun is at its worst. Changing rooms and showers on site.
- 4:20 PM Valladolid — Francisco Cantón Rosado park with its original railings, the church of San Servacio and the murals in the town hall.
- 8:00 PM Back in Mérida — We drop you off where the day started.
Included: Air-conditioned transport, General culture guide, Regional buffet lunch
Not included: Chichén Itzá entrance, Cenote entrance, Drinks
Archaeology · 11 h
Maya Train, Chichén Itzá and Izamal
The Mérida–Izamal leg by train, the rest by road
from $1,600 MXN per person
See itinerary
8:00 AM – 7:00 PM · daily
- 8:00 AM Transfer to the station — From the office to the Maya Train station in Mérida.
- 9:18 AM Maya Train ride — Forty minutes from Mérida to Izamal. Ticket included.
- 10:15 AM Izamal — The yellow town, the three-tier Baroque altarpiece and free time on the main square.
- 12:30 PM Chichén Itzá — Guided walk through the Sacred Cenote, the Temple of Kukulkán, the Jaguars and Eagles platform and the Ball Court.
- 2:30 PM Lunch in Kaua — Buffet of typical regional dishes.
- 3:45 PM Selva Maya cenote — The swim of the day, with the heat already easing off.
- 5:00 PM Back to Mérida — Two hours on the road back.
Included: Transport, General culture guide, Maya Train ticket Mérida–Izamal, Midday meal
Not included: Chichén Itzá entrance, Cenote entrance, Drinks
Transfers · 10.5 h
Transfer to Chichén Itzá
Four stops, your own pace and the van waiting
from $2,650 MXN per vehicle
Coupon −$300 MXN per personCaribbean · 14 h
Tulum and the Casa Tortuga cenotes
The only Maya city built facing the Caribbean
from $2,500 MXN per person
See itinerary
6:00 AM – 8:00 PM · daily
- 6:00 AM Boarding — We leave from the downtown office. If your accommodation is on the way, we collect you there — agreed beforehand on WhatsApp.
- 6:30 AM Motorway to the rest stop — An hour and three quarters, with fifteen minutes for toilets and something light.
- 8:30 AM On to Tulum — An hour and a half more to the Quintana Roo coast.
- 10:00 AM Tulum archaeological site — Guided visit to the walled city: El Castillo, the Temple of the Frescoes and the Temple of the Descending God, with the sea behind.
- 12:15 PM Casa Tortuga cenotes and lunch — Four cenotes of different kinds, with a guided route, trails and changing rooms. Lunch is on site.
- 4:00 PM Back to Mérida — Four hours back, with a stop halfway.
Included: Guide accredited by the Ministry of Tourism, Round-trip transport, Lunch, Cenote entry
Not included: Tulum archaeological site entrance, Drinks
Frequently asked questions
What happens at Chichén Itzá on the equinox?
Sunlight forms a serpent shape on El Castillo's northwest balustrade, ending at the stone head.
Is it only visible on the equinox?
No. Researchers document the pattern at other times of year as well.
What time can you see it?
In the afternoon, when the sun lights the northwest balustrade; it depends on the sky.
Is it crowded?
Yes, crowds are usually very large on equinox dates.
