The Aztec calendar is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout ancient Mesoamerica. The calendar consisted of a 365 day calendar cycle called xiuhpohualli (year count) and a 260 day ritual cycle called tonalpohualli (day count). These two cycles together formed a 52 year "century". Author unknown. 1 AI : 1,4 MB
Real cool vector map of the London Tube. The London Underground is the world's oldest underground railway and the oldest rapid transit system. It was also the first underground railway to operate electric trains. It is usually referred to as the Underground or the Tube. Author unknown. 1 AI : 550 KB