 Because the ancient Egyptian year was almost a quarter of a day shorter than the solar year and stellar events "wandered" through the calendar, it is referred to as Annus Vagus or "Wandering Year".The Nisga'a calendar coincides with the Gregorian calendar with each month referring to the type of harvesting that is done during the month.This calendar was proposed during the French Revolution, and used by the French government for about twelve years from late 1793.