Long story short, we have Leap Years because our “year” is based off Earth’s revolution around the Sun, which takes roughly 365 days. Our “day” is based on Earth’s rotation around it’s axis, its “spinning”. I said the Year is roughly 365 days, it’s actually 365*.25* days. That 0.25 days is a problem because our seasons are created by Earth’s position as it’s moves around the Sun. So after 100 years we’d be 25 days-worth-of-motion *out of position*, meaning *out of season*. So over long periods of time our seasons would be moving with relation to our months, and that just sucks.
So we invented Leap Year to “catch us up” a whole day every 4 years (0.25 x 4 =1 ) to reset the calendar back on track.
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