haha trixx., from my research into the various mayan calenders..
they had thay information available for many many thousands of years. as to compile data on precession. would take atleast 26,000 years,. I see the mayans as the latest civilisation with that knowledge.. they're many civilisations that also had similar data about teh solar system, aswell as similar calenders..
the mayans got they're inormation/data from the Olmechs,
im sure the olmechs got they;re information, from other parts of the world/other civilizations..
i can link up some videos if you like