Linked from

The 26 pages that link to Leap year, each with the reason it gives.

• Julian calendarBroader topic: The Julian calendar adds February 29 every fourth year.

• IntercalationBroader topic: A leap year applies intercalation at the scale of a whole year.

• CalendarBroader topic: The Gregorian calendar uses an extra day to track the tropical year.

• Year (calendar)Broader topic: Its added day makes some calendar years 366 days long.