Is the ignorance of Native American cultures just ignorance or deliberate?
Aside from the observatories in Central America - there are the medicine wheels and many other archaeo-astronomical designs that capture the solstice suns, to mark the seasons....
the observatory at Chichen - Itza - excerpt from site (link: http://www.civilization.ca/civil/maya/mmc07eng.html )
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(My daughter is going to the Yukatan to see Chichen Itza next week - envy envy)
from the link
"Of all the world's ancient calendar systems, the Maya and other Mesoamerican systems are the most complex, intricate and accurate. Calculations of the congruence of the 260-day and the 365-day Maya cycles is almost exactly equal to the actual solar year in the tropics, with only a 19-minute margin of error. Maya astronomer-priests looked to the heavens for guidance. They used observatories, shadow-casting devices, and observations of the horizon to trace the complex motions of the sun, the stars and planets in order to observe, calculate and record this information in their chronicles, or "codices". From these observations, the Maya developed calendars to keep track of celestial movements and the passage of time. The Maya also kept detailed records of the moon, although these do not seem to constitute a formal lunar calendar. With the aid of a forked stick, astronomer-priests used only the naked eye to take observations that allowed them to calculate the path of Venus and other celestial bodies. From the records of their observations they could calculate with precision events such as solar eclipses."
************ The Mayan's famous "Calendar Stone" (wrongly attributed to the Aztecs) prophecies about thirteen cycles of time - mostly now past - that end in Dec 2012...coinciding with the predictions of Nostradamus and Casey -
yep, those "prehistoric" savages were surely way behind us... /s