Why Does February 29 Occur Every 4 Years? Explained

Learn why February 29 happens every 4 years as a leap day to keep our calendar in sync with Earth's orbit around the Sun.

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February 29 occurs every 4 years due to the Gregorian calendar's way of correcting the discrepancy between the calendar year and the solar year. The Earth takes approximately 365.24 days to complete its orbit around the Sun, so an extra day is added every four years to keep our calendar in alignment with the Earth's revolutions around the Sun. This adjustment ensures that the seasons remain relatively consistent from year to year.

FAQs & Answers

  1. What is a leap year? A leap year is a year with an extra day added—February 29—to keep the calendar year aligned with the Earth's orbit around the Sun.
  2. Why is an extra day added every 4 years? Because the Earth takes about 365.24 days to orbit the Sun, adding one day every 4 years accounts for the extra 0.24 days per year and corrects calendar drift.
  3. Does February 29 occur every 4 years without exception? Almost every 4 years, but century years are only leap years if divisible by 400, as part of rules to accurately align the calendar, e.g., 2000 was a leap year but 1900 was not.

Watch More

If you found this explanation about February 29 and leap years interesting, check out our related videos on the history of the Gregorian calendar, how timekeeping has evolved, and fascinating facts about Earth's orbit and seasons.

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