Question

explain why we have leap year​

Answer 1

Answer:

But why do we even have leap years? 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.

Explanation:

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Answer 2

Answer:

It takes approximately 365.25 days for Earth to orbit the Sun — a solar year. We usually round the days in a calendar year to 365. To make up for the missing partial day, we add one day to our calendar approximately every four years. ... This is called a leap year.