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EXPLAINER: Why do leap years happen every four years?

It all has to do with Earth’s non-circular orbit around the sun

Earth's non-circular orbit is why we do Leap Years every four years.

ROANOKE, Va. – It’s that time again! We look at the calendar, expecting 28 days in February and *BAM*, that extra day 29th shows up.

Leap Day is a necessary part of keeping up with the artificial calendar we’ve created. Let’s explain.

It takes Earth 365.24 days to make a complete orbit around the sun. Earth’s orbit is elliptical - not a perfect circle - and it orbits at an angle of roughly 23.5° relative to that big orange fiery ball.

Our calendars, however, assume that a year is exactly 365 days. In order to correct for the imbalance that our time construct has created, we simply add a day every four years.

Earth's non-circular orbit is why we do Leap Years every four years.

2024 is a leap year. 2028 will be the next, and so on and so forth.


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