Chaco Canyon is also the site of a remarkable
solstice marker, located atop Fajada Butte in the main canyon. The marker resembles nothing more than a group of large slabs of rough stone leaning against the side of a cliff high up on the butte. On the wall of the cliff behind the stones
two spiral designs had been carved. at
midday of the winter soltice, light shining through the stone slabs casts a wedge-shaped beam upon the center of the larger spiral, which slowly descends through the spiral and disappears. For this reason, the marker is known as "The Sun Dagger".the marker also
marks the summer solstice and both equinoxes. the
19 year lunar cycle was also marked.
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http://www.solsticeproject.org/lunarmark.htm
