why do we have leap year
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Our calendar has 365 days in a year, because that's pretty much how long it takes the Earth to orbit the Sun. ... So Pope Gregory XIII created the Gregorian calendar, coined the term "leap year" and established February 29 as the official date to add to a leap year.
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Every four years, we add an extra day, February 29, to our calendars. These extra days – called leap days – help synchronize our human-created calendars with Earth’s orbit around the sun and the actual passing of the seasons. Why do we need them? Blame Earth’s orbit around the sun, which takes approximately 365.25 days. It’s that .25 that creates the need for a leap year every four years.
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