How Often Does February 29 Occur and Why?

Learn why February 29 happens every four years and how leap years keep our calendar aligned with Earth's orbit.

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February 29 occurs every four years, making it a leap day in the Gregorian calendar. This additional day is added to keep our calendar year synchronized with the astronomical or seasonal year. Because Earth’s orbit around the sun takes approximately 365.25 days, an extra day is added to the calendar every four years to account for this quarter-day accumulation.

FAQs & Answers

  1. Why is February 29 added every four years? February 29 is added every four years to compensate for the fact that Earth's orbit around the sun takes approximately 365.25 days, so an extra day is added to keep the calendar year synchronized with the astronomical year.
  2. What is a leap year? A leap year is a year that contains an extra day, February 29, to account for the additional approximately 0.25 days in Earth's orbit around the sun each year.
  3. How does the Gregorian calendar handle leap years? The Gregorian calendar adds February 29 every four years as a leap day, with some exceptions every 100 and 400 years to maintain long-term accuracy.

Watch More

For more interesting insights into our calendar system and timekeeping, explore related videos on leap years, the history of the Gregorian calendar, and how Earth's orbit influences our measurement of time.

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