At dusk on 21 March and 22 September, days before the start of spring and fall equinoxes,  in the north stairway of the Castillo de Chichén Itzá, a solar projection of a Serpent of LIGHT appears consisting of seven inverted triangles of light.  It is is formed as a result of the shadow cast by the nine platforms of the pyramid, which get the sun.
The phenomenon at Chichen Itza is seen in all its glory as the image of the serpent of light and dark triangles majestically  appear down the stairs north of the Castle. First, the first shadows of the higher bodies of the pyramid begin to draw isosceles triangles that make up the body of the feathered serpent. Later, the shadow gradually moves towards snake-shaped head located at the bottom of stairs.
The vision is of a serpent god Kukulkan, the most important deity of the Mayas, who descends slowly from the top to the bottom of the pyramid. This view is approximately 30 to 40 minutes, moment when all gathered there waiting to receive cosmic energy and recharge it.