The Chaco culture which inhabited the Chimney Rock area was hierarchical, with a priest class overseeing the area's inhabitants. The construction of the Great House Pueblo at the top of the ridge, close to Chimney Rock and its neighbor Companion Rock, had a large ceremonial role in the later years of Chacoan presence. As the moon makes its lunar cycle across the sky over a period of 18.6 years, it appears in a lunar standstill between the two rocks for approximately 16 months.
