Happy Leap Day!
Did you know that the Leap Day is not added every four years?
I thought that's how it worked. I thought a Leap Day was added every four years when the year is divisible by 4. But it turns out when it is a century year, that is a year evenly divisible by 100, so 2100, 2200 and so on; the year must be evenly divisible by 400 to be a Leap Year.
Leap Days were added because the solar year (the time it takes for the earth to make a revolution around the sun) is actually somewhat longer than 365 days so to keep the seasons aligned every so often there needs to be some time added.
