A leap year (also known as an intercalary year or a bissextile year) is a calendar year that contains an additional day (or in the case of a lunisolar calendar, an extra month) added to keep the calendar year synchronized with the astronomical year or seasonal year. Because astronomical events and seasons do not repeat in a whole number of days, calendars that have a constant number of days in each year will unavoidably drift over time with respect to the event that the year is supposed to track, such as seasons. By inserting (intercalating) an additional day (a leap day) or month into some years, the drift between a civilization's dating system and the physical properties of the Solar System can be corrected. A year that is not a leap year is a common year.
DO NOT go down the closed road. There is no need to. Cache can be accessed a few steps from Fletcher Drive.