Why does February 2020 have 29 days that appear once every few years?

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There are leap years and normal years in the Gregorian calendar.For example, 2020 is a leap year.In February, there will be one more day than a normal year, that is, there are 28 days.February will have 29 days in 2020.On February 29, this situation usually occurs once every four years.

The calculation method of the Gregorian calendar is based on the rotation time used by the earth to revolve around the sun, which is about 365.242188 days, but for the convenience of calculation, it is about 365 days, but this leaves the remainder after the decimal point., every four years, the remainder can be accumulated into one day, so every four years there is one more day than other years, and this kind of year is called a leap year, and a normal year with 365 days is called a normal year.The extra day in a leap year is February 29, so there are 29 days in February, which occur every four years.

Has February had 30 days?

February has not had 30 days.The reason why February has one more day every four years than other years is because every A year is not strictly a full year.According to the calculation method of the Gregorian calendar, a year should not actually be 365 days, but approximately equal to 365.242188 days.The excess 0.242188 days in each year is accumulated, which happens to be approximately equal to one day in the fourth year, so the fourth year will meet There are 29 days.It can also be said that the extra day in February of the fourth year is to make up for the time difference in these four years.So every four years there are 29 days of reincarnation, but never 30 days.

Why February is special this year

People say that February in 2020 is very special, because February in 2020 has one more day than other years, and this day is a leap day, This year is a leap year.Except for 2020, there is an extra day in February every four years, such as 1916, 1920, 1924, 1928, 1932, 1936, 1940, 1944, 1948, 1952, 1956 Year, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020, 2024 and so on.

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