Doing the Math on Why We Have Leap Day
You may have noticed that there's an extra day on your calendar this year. That's not a typo; it's leap day! Leap day is another name for Feb. 29, a date that typically comes around every four years, during a leap year. Why doesn't Feb. 29 appear on the calendar every year?
Read our primer on leap day to find out how the imperfect match between the length of a calendar year and Earth's orbit results in the need to make small adjustments to our calendar on a regular basis. Then, get students doing the math with our leap day math problem set and resources from NASA's Space Place.
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