Mayan astronomy was pretty amazing. Granted, their observations were wholly fueled by their religious practices -- but whatever the motivation, the dedication and precision they applied to mathematical calculations vis-a-vis celestial objects is impressive.Correction. The mathematical concept of zero is documented to have already been in use in South America by 36BC. Around 150AD it appears in India and Egypt. The 300 year figure I mentioned is speculation, not fact.
I wish I could live long enough to understand all the knowledge waiting to be found in the Americas pre European "discovery." To be able to compare how 2 civilizations isolated from each other would be priceless.