Twice a year, on March 21 and September 21, the sun  makes a shadow on the side of the stairs on the North side of El Castillo Pyramid in Chichen Itza forming a snake. This, used to be the sign for the Mayas to start planting the corn. This event is called The Equinox.

The fall equinox is one of the best times to visit Chichen Itza. It takes time in September 21, when the tilt of the Earth’s axis is inclined neither away from nor towards the Sun, being vertically above a point on the Equator, making a shadow effect simulating the serpent Kukulcan descending by El Castillo pyramid balustrades to join the snake’s head at the base of the temple. The best time to arrive is before 5 pm, to watch dancers and music performances. For optimum view of the serpent, try to be near the great courtyard which faces the western facet of the Kukulcan Pyramid. This time of year can be chilly in the evenings, so be sure to dress accordingly and don’t forget to bring insect repellent, since Chichen Itza is surrounded by jungle. This is a huge event that attracts many visitors, accommodations fill up fast, plan your trip in advance and arrive early. If you are planning to stay overnight at the nearby town, Pisté, book your lodging well in advance