Chaco Canyon: Interrelationships

This diagram shows the interrelationship for the buildings within the canyon. All relationships displayed here are within 3 degrees of the values calculated with modern instruments.

The lunar cycle that determines the Major and Minor Standstills is 18.6 years long. It would have taken generations of like-minded astronomers to calculate these values accurately.

Another point to note is that the line connecting Pueblo Alto and Tsin Kletsin bisects the line drawn between Chetro Ketl and Pueblo Bonito.