Chichén Itzá, equinox

As happened over 1,000 years ago , the phenomenon of the equinox ( 21/22 March and September) in the temple of Kukulkan at Chichen Itza, still moves the hearts of viewers. In these times of year , the play of light and shadow in the temple creates this optical illusion : that of a
snake that moves. Thousands of fans gather at Chichen Itza to experience the magic of watching maya snake down the temple.

 It has been found that in the equinoctial days , before hiding the sun between 14:15 to 16:50 Hrs , the shadows of the corners of the overlapping platforms on the north side , go up and down projecting successively on the shore the north alfarda until clear form with seven isosceles sunlight angles, so that the assembly resembles a wavy body snake down pyramid appears because the seventh triangle coincides with the throat that is initially reptile of the balustrade . This phenomenon lasts a few minutes as the sun sets , and the triangles disappear in reverse order , ie from the bottom up .