WASHINGTON, May 12: On the wall of a tiny structure buried under forest debris in Guatemala, archaeologists have discovered a scribe’s notes about the Maya lunar calendar, which they say could be the first known records by an official chronicler of this ancient civilization. These notes pertain to the same Maya calendar that is sometimes erroneously thought to predict the world’s end on or about December 22, 2012. The researchers who helped uncover and decipher the wall’s inscriptions said the Maya calendar foresaw a vast progression of time, with the December 2012 date the beginning of a new calendar cycle called a baktun. (agencies)