How many years does a leap year occur? What about the next ordinary year?

In general, leap years occur every 3 years, and the rest are ordinary years.

But there are exceptions, such as 1900. 1900 is divisible by 4, but is not a leap year. 1900 The year that is divisible by 4 is 1896. From 1896 to 1904, there was a leap year after a gap of 7 years.

Ordinary leap year: The Gregorian year is a multiple of 4, which is generally a leap year. (e.g. 2004 is a leap year);

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

A non-whole 100-year part divided by 4, and a whole 100-year part divided by 400 is a normal year.

Extended information: The usual explanation is to say how many days, hours, and minutes there are in a year, and the whole number 365 is redundant, and after the accumulation reaches 24 hours in a day, the year in which an extra day is added is a leap year. This explanation just tells everyone how to calculate, and it is something that is set artificially.

The most fundamental reason is that the Earth's orbit around the Sun is 365 days, 5 hours, 48 minutes and 46 seconds (conjunction), which is a tropical year.

The common year of the Gregorian calendar is only 365 days, which is about one day shorter than the return year, and the remaining time is about one day accumulated every four years, so the fourth year adds one day at the end of February, so that the length of the calendar year of the year is 366 days, and this year is a leap year. There are 97 leap years in the current Gregorian calendar every 400 years.

According to a leap year every four years, the average number of days per year is to be counted out, so that after 400 years, about 3 days will be calculated. Thus three leap years are reduced every 400 years. So the Gregorian calendar prescribes:

When the year is an integer hundred, it must be a multiple of 400 to be a leap year; A century year that is not a multiple of 400, and even a multiple of 4 is not a leap year.

This is what is commonly said: every four years, no leap in a hundred years, and another leap in four hundred years. For example, 2000 is a leap year and 2100 is a common year.

The longest lunar leap year can have up to 385 days, which is very rare. In the 2,120 years from 221 BC to 1900 AD, there were only 9 in total. It occurs 22 times in the 2100 years from 1900 to 4000 AD, and the following years are:

1925, 1944, 2006, 2270, 2289, 2351, 2606, 2625, 2634, 2889, 2951, 2970, 3234, 3253, 3296, 3315, 3589, 3608, 3872, 3915, 3934, 3953.

There are only 353 days in the ultra-short lunar year in ordinary years, and between the first year of the year and 5000 AD, there are only the following 9 years with 353 days in the lunar year:

780, 1620, 1965, 2372, 3620, 3903, 3965, 4186, 4248.

Where there is a leap day (February 29) in the solar calendar, the leap more (the year is more than the leap year. The difference in time between the lunar calendar and the return year).

Intercalation rules since 1582:

Ordinary leap year: If the Gregorian calendar year is a multiple of 4 and not a multiple of 100, it is a leap year (such as 2004, 2020, etc. are leap years).

Century leap year: The Gregorian calendar year is a whole hundred, and it must be a multiple of 400 to be a leap year (e.g., 1900 is not a leap year, 2000 is a leap year).

Pre-1582 convention: every leap every four years; If a (positive) in A.D. is divisible by 4, then it is a leap year; If the b (positive number) of year b BC is divided by 4 and the remainder is 1, then it is also a leap year.

Zhang Shengyong's 1925 "Flower Picture" opened in leap years.

There are three common years and one leap year in four years. Generally, if the number of Gregorian years is a multiple of 4, it is a leap year, otherwise it is a common year; So there are usually 3 common years and 1 leap year every 4 years. For example, Yu Qi:

From 2000 to 2003, 2000 was a leap year, and 2011, 2012, and 20013 were common years.

The leap year was established to make up for the time difference between the number of days of the year and the actual orbital cycle of the earth due to the man-made calendar. The year in which the time difference is made up is a leap year. There are 366 days in a leap year.

There is a leap year and three flat years for every four years of rotten base.

Leap year: It was established to compensate for the time difference between the number of days of the year and the actual orbital cycle of the earth caused by the man-made calendar. The year in which the time difference is made up is a leap year. Leap years include those that have a leap day or leap month in the Gregorian or summer calendar. Leap years have 366 days.

Ordinary year: A year of famine without a leap day on the solar calendar or a leap month in the lunar calendar is called a common year. The solar calendar has 365 days in a normal year, 354 or 355 days in a lunar ordinary year, and in rare cases 353 days.

1.A leap year is a quadrennial, i.e., a leap every four years.

2.In addition, there is no leap in 100 years, and then in 400 years.

3.Gregorian calendar years are whole hundreds, and must be multiples of 400 to be a leap year (e.g., 1900 is not a leap year, 2000 is a leap year).

4.Leap years are set up to make up for the difference between the number of days of the year and the actual orbital cycle of the earth caused by the artificial calendar.

5.The year in which the time difference is made up is a leap year.

6.There are 366 days in a leap year (31 days, 29 days, 31 days, 30 days, 31 days, 30 days, 31 days, 31 days, 30 days, 31 days, 30 days, 31 days from January to December, 30 days, 31 days).