What year is February 29th in the solar calendar?

During the period of 1950-2050, there were:

1952、 1956、 1960、 1964、 1968、 1972、 1976、 1980、 1984、 1988、 1992、 / kloc-0/996、2000、2004、2008、 20 12、20 16、2020、2024、2028、2032、2036、2040、2044、2048。

The earth's cycle around the sun is 365 days, 5 hours, 48 minutes and 46 seconds (365.438+09 days), which is a tropical year. The Gregorian calendar has an average of only 365 days a year, which is about 0.2422 days shorter than the tropical year, and the remaining time is about one day every four years. So 1 day is added at the end of February of the fourth year, making the calendar year of that year 366 days, and this year is a leap year.

The current Gregorian calendar has 97 leap years every 400 years. According to a leap year every four years, it will count as 0.0078 days per year on average, so after 400 years, it will count as 3 days. So every 400 years, three leap years will be reduced. Therefore, the Gregorian calendar stipulates that when the year is a whole hundred, it must be a multiple of 400 to be a leap year; It is not a century year with multiples of 400, and even a multiple of 4 is not a leap year.

Extended data

Leap year and average year

A year without a leap day in the solar calendar or a leap month in the lunar calendar is called an average year. Divide by four in a hundred years, and divide by 400 in a hundred years, which is not divisible. February in a normal year has 28 days, while February in a leap year has 29 days. The average solar year is 365 days, the average lunar year is 354 days or 355 days, and very few days are 353 days.

From the first year of A.D. to 5000 A.D., there were only the following years with 353 days in the lunar calendar: 780, 1620, 1965, 2372, 3620, 3903, 3965, 4 186 and 4248. In some areas, the average year also refers to the year when the crop harvest is very common. A year with a leap month in the lunar calendar is called a leap year, and the lunar calendar adopts the method of 19 plus 7 leap months, that is, the "7 leap year method of 19", that is, the lunar calendar 19 has 7 leap years.

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