The Thirteen Moon Calendar is any calendar that is based on the actual thirteen cycles of the moon during the course of a year, rather than the unharmonic and irregular 12 "month" calendar. The Thirteen Moon Calendar is based on a simple, natural rhythm of 13 Moons of 28 Days + a Day Out of Time for global celebration of Peace Through Culture. The 13 Moon 28 Day Count sprung up as a measure of natural time in cultures as geographically diverse as the Inca, the Ancient Egyptians, the Druids, the ancient Hebrews, the Babylonians, and the Polynesians.