Photographer and radio broadcaster Joe Kleon writes:

The Temple of Kukulkan, the Feathered Serpent God (also known as Quetzalcoatl to the Aztecs) is the largest and most important ceremonial structure at Chichen Itza (pictured below) in the Yucatan of Mexico. This ninety-foot tall pyramid was built during the eleventh to thirteenth centuries directly upon the multiple foundations of previous temples. The architecture of the pyramid encodes precise information regarding the Mayan calendar. Each face of the four-sided structure has a stairway with ninety-one steps, which together with the shared step of the platform at the top, add up to 365, the number of days in a year. These stairways also divide the nine terraces of each side of the pyramid into eighteen segments, representing the eighteen months of the Mayan calendar.

The pyramid is also directionally oriented to mark the solstices and equinoxes. The axes that run through the northwest and southwest corners of the pyramid are oriented toward the rising point of the sun at the summer solstice and its setting point at the winter solstice. The northern stairway was the principal sacred path leading to the summit.

At sunset on the vernal and autumnal equinoxes, an interplay between the sun's light and the edges of the stepped terraces on the pyramid creates a fascinating - and very brief - shadow display upon the sides of the northern stairway. A serrated line of seven interlocking triangles gives the impression of a long tail leading downward to the stone head of the serpent Kukulkan, at the base of the stairway. Adjacent to the head of Kukulkan, a doorway leads to an interior staircase ending at a small and very mysterious shrine.

To view more of Joe Kleon's photographs of ancient Mayan sites visit: g4orce-studios.com/chichenitza.html