Скачать или смотреть Skip the Leap: Once every 100 years, we leap over leap year

A leap year exists, in large part, to keep the months in sync with annual events, including equinoxes and solstices, according to the Jet Propulsion Laboratory at the California Institute of Technology.

It's a correction to counter the fact that Earth's orbit isn't precisely 365 days a year. The trip takes about six hours longer than that, NASA says.

But contrary to what some might believe, not every four years is a leaper. Adding a leap day every four years would make the calendar longer by more than 44 minutes, according to the National Air & Space Museum.

In the past 500 years, there was no leap day in 1700, 1800 and 1900, but 2000 had one. In the next 500 years, if the practice is followed, there will be no leap day in 2100, 2200, 2300 and 2500.

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