The Earth takes roughly 365.2421 days to orbit the sun, not exactly 365 days. This small difference adds up over time, throwing our calendar out of sync with the seasons.
Leap year adds an extra day, February 29th, to keep things aligned.
Though it seems straightforward, there's a twist! While most years divisible by four are leap years, century years (ending in 00) are not, unless they're also divisible by 400.
People born on February 29th are called "leaplings" or "leapers."
There are only around 5 million leaplings worldwide, making them a unique group.
In Ireland and Scotland, it's traditionally the day women can propose marriage to men.
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In Greece, it's considered unlucky to get married on February 29th.
Leap years bring an extra 24 hours, or 1440 minutes. Some people use this as an opportunity for an extra special celebration