The 365 days of the calendar year represent the Earth’s movement around the Sun every 365 days, 5 hours, 48 minutes and 46 seconds. Therefore, the leap day exists to correct the difference between the calendar year and the astronomical year. The calendar is adjusted to compensate for the extra time by adding an extra day to the year after about four years. If we didn’t add a leap day on February 29 nearly every four years, we would lose almost 6 hours off our calendar every year. After a 100 years, are calender would be off by around 24 days.
Why does a leap year have 366 days?
