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Have you ever thought about the fact that every four years, a random day is included in the calendar? Plus, it adds an extra day to an already short month. Scientifically speaking, leap days are essential to keeping the calendar on track.
The time it takes for the Earth to orbit the Sun is not exactly 365 days. Instead, it would be about 365.2422, or 365 days and he would be 5 hours, 48 minutes, and 56 seconds.
If you don’t account for extra time, the seasons will eventually start to slip off the calendar.
According to the Smithsonian Institution, in 700 years, summer in the Northern Hemisphere will be in mid-December.
By adding one day every four years, the calendars are approximately in sync.
Over a period of four years, the difference between a calendar year and a leap year (or sidereal year) is not exactly 24 hours, but only 23.2622222 hours. Adding a leap day every four years adds 44 minutes to the calendar.
Again, over time, the seasons shift on the calendar. Therefore, not every fourth year is a leap year.
If the year is divisible by 100 but not by 400, leap years are skipped. 2000 was a leap year, but 2100 is not.
Leap Day; Named after a special day of the year.
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