介绍:
A year is how long it takes for the Earth to orbit the Sun exactly once. So while the Earth orbits around the Sun in a full year, it spins around 365.25 times. In other words, one full year equals 365.25 days. This is called the astronomical year. But here is the problem, calendar year is only 365 days. And that's because there's really no way to have a 0.25 day. And so those extra 0.25 days, they just keep accumulating. And what they do is make it so that the stars slowly drift out of sync with our calendar. So this is where Leap Year comes in to save the day.
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