Originally Posted by fxashun

Naa, some dipshit web site convinced me that their calendar is more accurate than the one we used.
The Mayan calendar is based upon astronomical observations and is accurate to one day in 10,000. That is a standard better than the modern calendar that we use today.

I'll pass on the rest of the culture as you clearly alluded to. Although as the linked article pointed out, there were other mathematically advanced elements to their society. They just thought human sacrifice was cool.