This is in part an outgrowth of my recent ideas on the function of astronomy in the rise of Chaco Canyon to local prestige, which consequently was spurred partly by the understanding that Chaco shows up to reveal the earliest proof for complicated expensive knowledge in the north Southwest. The idea, which I checked out precisely one year ago in this message, is that by the eleventh century AD the Chacoans established an understanding of astronomy that they had the ability to utilize as esoteric ritual expertise to enhance the canyon's duty as a political as well as economic power throughout the area. The outcome of this is that we have strong evidence here that there was a. technique in at least one Chacoan great house in the late 1000s as well as early 1100s of residential use of area collections concentrated on big square rooms facing the plaza. It's difficult to tell if this pattern
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