Why is 2000 a leap year? Isn't it a leap year divisible by 4 but not by 100? .

Leap years are divided into ordinary leap years and century leap years.

1, ordinary leap year: the Gregorian calendar year is a multiple of 4, which is generally a leap year. (For example, 2004 is a leap year);

2. Century leap year: Gregorian calendar year is an integer, and it must be a multiple of 400 to be a leap year (for example, 1900 is not a century leap year, and 2000 is a century leap year);

2000÷4=500, so 2000 is a leap year.

Extended data

The year 2000 is a leap year in the Gregorian calendar, with a total of 366 days. 52 weeks and 2 days. In the year of Chen Geng (the Year of the Loong), there was no leap month, with a total of 354 days. The last year of the 20th century is also the beginning of the 20th century 1 10. 5 1 anniversary of the founding of People's Republic of China (PRC).

The establishment of leap year is to make up for the time difference between the number of days in a year and the actual period of revolution of the earth caused by man-made calendar regulations. The year to make up for the time difference is leap year. The leap year has 366 days (February 1- 1 day, 29 days, 3 1 day, 30 days, 3 1 day, 3 1 day.

Where there is a leap day in the solar calendar (February 29); Leap surplus (leap surplus). The time difference between the lunar calendar and the tropic year);

Please note that leap year (a term in the Gregorian calendar) is not directly related to leap month (a term in the lunar calendar). The Gregorian calendar has only leap years and peace years, with 365 days in a normal year and 366 days in a leap year (one more day in February). There may also be leap months in a normal year (for example, 20 17 is a normal year, and there are leap months and leap months in the lunar calendar).

Baidu Encyclopedia -2000

Baidu encyclopedia-leap year