A documentary about the celestial calendar created by the Anasazi — and rediscovered by artist Anna Soafer, high on a butte in Chaco Canyon, New Mexico — over a thousand years ago.

At its heart lies Chaco Canyon. 1000 years ago ... since her rediscovery of the Sun Dagger, Anna Sofaer, seen here with Pilot Adriel Heisey, (Anna speaking faintly) has conducted independent ...

Chaco Canyon also records celestial symbolism ... And one of the most famous sites, known as the Sun Dagger, manipulates the light of the summer solstice to illuminate an elaborate carving.