What Is a Leap Year? Fun Facts and How It Works Explained

Discover fun facts about leap years and why February has 29 days every four years to keep our calendar in sync with Earth's orbit.

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Leap years add a day to the end of February, making it 29 days long, to keep our calendars in alignment with the Earth’s revolutions around the Sun. It takes the Earth approximately 365.24 days to complete its orbit, so an extra day is added every four years to compensate for this quarter-day discrepancy. Interestingly, a year that is divisible by 100 is not a leap year unless it is also divisible by 400. This means 2000 was a leap year, but 1900 was not.

FAQs & Answers

  1. Why do we have a leap year? A leap year adds an extra day every four years to account for the Earth's orbit taking approximately 365.24 days, keeping our calendar aligned with the seasons.
  2. How is a leap year determined? A year is a leap year if it is divisible by 4, except for years divisible by 100, unless they are also divisible by 400.
  3. Why was the year 2000 a leap year but 1900 was not? The year 2000 was divisible by 400, making it a leap year, while 1900 was only divisible by 100 but not 400, so it was not a leap year.

Watch More

If you enjoyed learning about leap years, check out our related videos on calendars, timekeeping, and the science behind seasons to deepen your understanding of how we measure time.

  1. What Is Leap Day and Why Does It Occur Every Four Years? Learn why Leap Day occurs every four years on February 29th to keep our calendar aligned with Earth's orbit around the Sun.
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  3. Why Do We Have Leap Years? Understanding the Purpose of Leap Year Learn why leap years exist and how adding February 29th keeps our calendar aligned with Earth's orbit and the seasons.
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