(give you a sense of Maya They've built pyramids. Some of the pyramids have been known to be Mayan Calenders and have 365 steps. The Pyramids are postioned as exact so that the Maya were able to know precisly when the Winter Equinox would start and when it would end known as the Spring Equinox through the shadow of the pyramids, therefore marking the lonest/shortest day in the year.

The Mayan year was more accurate and unique. Their calender consisted of a 260-day religous calender, twenty 30-day months with a seperate 5 days at the end. The precise calenders were based upon careful observation of the planets, sun, and moon. For example, the Mayan atronomers calculated that a year contained 365.2420 days. Scientists now know that the Mayan year was .0002 of a day too short! -'World History: Perspectives on the Past'
They have also predicted when the moon will rise and set and when it will be full moon. Scientists have known the precise moonrises and sets throught-out the modern day. When they studied the Mayan records of when the moonrise and moonsets would occure, scientists figured that the Mayan were 33 seconds off the actual time!!
EDITED(sry):
QUOTE(McDougal Littel"World History: Perspectives on the Past" @ Fifth Edition)
The Maya worshiped a number of gods. For example, they believed that each day was a living god whose behavior could be predicted with the help of an intricate system of calendars. Their 260-day religious calendar consisted of twenty 13-day months. A second 365-day calendar consisted of eighteen 20-day months, with a separate period of 5 days at the end. The two calendars were linked together like meshed gears so that any given day could be identified in both cycles. The Maya used their calendars to help determine the best times to plant crops, attack enemies, or crown new rulers.
The Maya predicted these using their calender, usually a set of gears.

They had many predictions, and here was one of them:
--Great Birds will come from the sky and end a great city to the north at 9/11/01.
Fact: 2 airplanes(birds) struck the twin towers of NewYork(great city), a city to the north.
"Great Birds from the sky..."Heres another one:
--The End of the World will be marked at Sunday December 23, 2012.
Fact: There have been stories in the bible about the 40-day flood that ended the world, stories that the world ended and humans would rise again. You think this will happen in 2012?
----lol, I learned most of this from my history class and a movie that was completely made by scientists and very modern looking, and no its not propaganda. So what do you think? Will the world end in 2012? New York sure was struck in 2001 by giant birds. What are the chances of the world ending?
(sorry if it was too long)