Abstract
The streets of this Classic period city were laid out in a grid pattern. The axes of this grid were almost, but not exactly, perpendicular. There were a number of celestial bodies that in the period from A.D. 150 to A.D. 750 rose or set so as to markthe orientations of the streets. The Pleiades, Sirius, and the sun were the most probable orientation points. Two techniques which have been developed to test the more certain past existence of celestial references are described.

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