On the equinoxes the sun is positioned directly over equator and the length of day and night is nearly equal which means earth’s two hemispheres are receiving the suns’ rays equally. Even the word “equinox” comes from the Latin and means “equal night”.
The day of the spring equinox marks the beginning of spring and the end of winter that’s why in many places in Mexico there are spring festivals that they call “festivals de primavera”.
Chichen Itza is the most popular spot in Mexico to celebrate the spring equinox. During the spring equinox, thousands of visitors gather to witness the phenomena of the light and shadow movements, like serpent, that descent the steps of the Castillo Pyramid. It looks like a 120 ft length snake is creeping downstairs till it joins a huge serpent’s head at the bottom of the stairway.
Equinox in Chichen Itza is truly a dramatic display of Mayan Astronomical knowledge, stunning architecture and incredible geometry. People built pyramid to calculate the time of year when the hours of day and night equal in 1500 BC.
It is an experience of lifetime for many visitors which appear for a few days around 4pm in March between 19th and 23rd (the dates for the spring equinox may change from year to year). But the light effect is most obvious on the actual date of the spring equinox. Even Easter is calculated according to the date of the spring equinox.