Spring Equinox at Chichen Itza

"Equinox--The Mayan Astronomers"
Ancient stone masons built and aligned this stone pyramid centuries ago to project the sun's rays into a diamond-back rattlesnake of light and shadow.
On the morning and evenings of Equinox March 20, 21 and September 21, 22 thousands flock to Chichen Itza to view the same dramatic display.
In the spring, the sight is clearly visible in the early evening from mid to late February, and through mid-April. In the fall the appearence is visible from mid August through mid October.
For optimum viewing of the serpent of light, be near the great courtyard which faces the western facet of the Kukulkan Pyramid beginning at about four in the afternoon. The best viewing of the sight is from five days before until five days after Equinox. Needless to say, accomodations fill up fast! On the actual day of Equinox, people stake out their vantage point early in the day, as a great sea of humanity begins to deluge one of the great wonders of the world!