Book excerpt: Between the 10th and 14th century's AD a grand civilization developed in what are now the 4 corners of the USA, encompassing approximately 10,000 square miles. Many scholars have studied this "Chaco Phenomena" and have ascertained that there was great influence from cultures of the South in what is now Mexico and Guatemala. Parrots, Macaws, cacao certain iconography and burial effects found in the Chaco Domain are consistent with materials mentioned in the Mayan Popol Vuh describing specific attributes of Ahauship (kingship) in Meso-America. These items have been found within the Chaco Domain. Implicit in the above is the use of Meso-American calendrics, which eluded scholars until recently. MacGillivray has rediscovered the use of the Hubbard site by analysis of original site interpolated with Mexica, Mayan and Zapotec; cosmological records of the Dresden Codex interfaced with the Tzolkin, showing a astronomical continuum in architecture and "day keeping traditions" for millenniums which is expressed in the Chacoan Tzolkin. The Aztec ruins in N.M. are of paramount importance in this ancient American tradition. Although having been "backfilled" years ago, the Hubbard tri-wall at Aztec, N.M. through archaeological documentation and new research proves itself to be a Venus calendar. Venus is very important in Indigenous cosmology as it represents Quetzalcoatl / Sacred Plumed Serpent, harbinger of the sun. The knowledge of Venus cycles shows advanced astronomical knowledge at Aztec suggesting that a specialized group of Shaman/Priests did live there, "the day keeper's and diviners" of the later Chaco Domain. The Hubbard Venus Calendar and Chacoan Tzolkin gives us a glimpse of what cosmology future scholars will find embodied in the two unexcavated tri-walls at Aztec on the Animas and else where in the Chaco Domain and Pan America.