Cerillos Hills State Park, NM, 2/15/15

Cerillos Hills is New Mexico's newest state park.  Located just south of Santa Fe off route 14, it preserves the area that knew a brief mining boom in the mid 1800's.

An additional attraction was the Analemma sun dial similar to the sun structures at Chaco Canyon.

Note the pointer, or gnomon, at the top of the circular south-facing opening. The center of the gnomon acts as a pin-lens to project the rays of the sun on the floor. 

A figure eight, an analemma, is formed by the trajectory of the sun.  Both the time of day and the date can be determined by noting the trajectory of the sun.