Autumn Equinox at the Pyramids in Mexico

September 23, 2009 12:00:00 AM PDT
It still feels like summer in the Valley, but in Mexico people are celebrating the autumn equinox.Thousands of people gathered at the Mayan ruins in Chichen Itza, Mexico to chant, sing and be together.

The equinox happens twice a year when the tilt of the earth's axis is inclined neither away from nor towards the sun because the sun is vertically above a point on the equator.

During autumn and spring, the sunlight causes seven triangles to form a serpent-shaped shadow down a pyramid's main stairway which then meets a stone, snake-head carved at the bottom.

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