February 29th is the 60th day of leap year in Gregorian calendar, and there are 306 days before the end of the year. February 29 will not appear in general years, but only in leap years, usually once every four years.

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The time interval of the earth's revolution around the sun is about 365.2422 days, while the calendar we adopt is only 365 days a year, that is to say, there will be nearly one more day in the calendar every four years. In order to solve this remainder, an extra leap day-February 29th is added every four years.

The julian calendar formulated by the ancient Romans in 46 BC did this for the first time. However, there is still an error compared with the actual length of the solar year, so we have to cancel three leap days every 400 years. This is the Gregorian calendar that is now popular all over the world.

If the age is accumulated by a birthday, there is no doubt that people born on February 29th are much younger than others. After all, it doesn't happen every year on February 29th. Based on this calculation, people born on February 29th are old at the age of 20.

February 29th is a very special day, which is a little more than 365 days a year for human beings. The 366th day of the year was set by Julius Caesar, who announced that only one day could be added every four years. However, when Pope Gregory I found that one more day every four years is actually too much, the most correct way should be to jump every four years, not every hundred years, such as 2 100 and 2200, but every 400 years, such as 2000 and 2400.

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