Why do we need to add an extra day to our year every 4 years?

Why do we need to add an extra day to our year every 4 years?
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1 Answer

Answer :

Because - the Earth takes 365.25 days to orbit the sun once. Ifwe didn't add the extra day every four years - the seasons andmonths would be 'out of step' - and we would have winter inJune.
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