**Leap year calendar**.
So the leap year rule add a leap year every four years was a good rule but not good enough.
This is hard to calculate with so a normal year has been given 365 days and a leap year 366 days.
Role reversal on leap day.
Leap years have 366 days not 365.

A leap year is a year with one additional day which is added to keep synchronized with the astronomical year. List of leap years. Nearly every four years is a leap year which has 366 days as opposed to a common year which has 365 in the gregorian calendar. One year has the length of 365 days 5 hours 48 minutes and 45 seconds.

This extra day makes the year 366 days long not 365 days like a common year. Seasons of the year and astronomical events do not repeat in a whole number of days so it is necessary to add an extra day every few years to catch up with the astronomical year. Whether a wall desk or engagement we have it with leap year publishing. A leap day february 29 is added to the calendar during leap years.