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A Leap-Year is a year which occurs each 4 years average and adds an extra day to the Calendar, the 29th of February.
This is done to keep the mean solar year and the seasons in sync with the Calendar.

The revolution of the earth around the sun is a solar year which takes approximately 365.25 days in average.
A (non-leap) year in our Calendar takes 365 days, a Leap-Year each 4 years takes 366 days to correct to this average:

365 + 365 + 365 + 366 = 1461 days in 4 years

1461 / 4 = 365.25 days average per year

Since 365.25 only approximates a mean solar year a Leap-Year must match these conditions:

  • A year which is evenly divisible by 4
  • A year which is evenly divisible by 100 is NO Leap-Year unless it is evenly divisible by 400

Who ever invented this simplification of complication - respect!


  • 2000 is evenly divisible by 4 and by 100 and by 400 => Leap-Year
  • 2020 is evenly divisible by 4 but not by 100 => Leap-Year
  • 2100 is evenly divisible by 4 and by 100 but not by 400 => no Leap-Year


See the Calendar article.


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