It's AumSum Time.
Why do we have Leap Years?
Simple.
Because I can take Great Leaps.
Oh AumSum.
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By definition, A leap year is a calendar year.
That contains an additional day added to keep the calendar year synchronized with the astronomical year.
Our year consists of 365 days.
A year is the amount of time it takes a planet to orbit its star one time.
It takes Earth approximately 365 days and 6 hours to orbit the Sun.
So there is a difference of 6 hours between our calendar year and solar year.
Now, those 6 hours just can't disappear.
Right?
In order to make sure that our calendar year matches the solar year, after every 4 years.
We add those 6 hours 4 times, i.e. 1 day is added to a year.
Thus, this year has 29 days in February instead of 28.
This is why we have Leap Years.