Stephanie Pappas, LiveScience Senior Writer
Date: 10 May 2012 Time: 01:56 PM ET

The oldest-known version of the ancient Maya calendar has been discovered adorning a lavishly painted wall in the ruins of a city deep in the Guatemalan rainforest.

The hieroglyphs, painted in black and red, along with a colorful mural of a king and his mysterious attendants, seem to have been a sort of handy reference chart for court scribes in A.D. 800 — the astronomers and mathematicians of their day. Contrary to popular myth, this calendar isn't a countdown to the end of the world in December 2012, the study researchers said.

"The Mayan calendar is going to keep going for billions, trillions, octillions of years into the future," said archaeologist David Stuart of the University of Texas, who worked to decipher the glyphs. "Numbers we can't even wrap our heads around."

The newly discovered calendar is complex indeed, featuring stacked bars and dots representing fives and ones and recording lunar cycles in six-month chunks of time. But it wasn't these mathematical notations that first caught the archeologists' eye. William Saturno, an archaeologist from Boston University, was mapping the ancient Maya city of Xultun in northeast Guatemala in 2010 when one of his undergraduate students peered into an old trench dug by looters and reported seeing traces of ancient paint.

More: http://www.livescience.com/20218-apocalypse-oldest-mayan-calendar.html