Why do we have a leap year in our calendar every four years?

every 4 years we add an extra day, February 29th, to our calendars these extra days called leave days help synchronize our human created calendars with us orbit around the sun and the actual passing of our seasons

Citation below^^

Explanation:

“Leap years exist because it takes the Earth 365 days, five hours, 48 minutes and 45 seconds to orbit the sun -- almost an extra quarter of a day per year. Once every four years, an extra day is added to the month of February. That year is considered a leap year, and February 29 is known as a leap day.”

Hope this helps!

have a lovely day :)

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