Why is 2008 a leap year in the national calendar and 2009 in the lunar calendar?

The law followed in determining a leap year in the Gregorian calendar is: one leap in four years, no leap in one hundred years, and another leap in four hundred years.

A simple calculation of a leap year in the Gregorian calendar: (A leap year is a leap year if one of the following conditions is met)1. Divisible by 4 but not by 100. (For example, 2004 is a leap year, 1900 is not).

2。Divisible by 400. According to these rules, it can be concluded that 2008 is a leap year in the Gregorian calendar.

As for why 2009 is a leap year in the lunar calendar, I can't say the specifics, but there doesn't seem to be a specific pattern. Generally speaking, it is a leap in 3 years, two leaps in 5 years, and seven leaps in 19 years; But the first two don't work all the time. The lunar calendar is basically a cycle of 19 years, corresponding to the same time in the Gregorian calendar.

For example, May 27, 2001, May 27, 1982 and May 27, 1963 in the Gregorian calendar are all the fifth days of the fourth month of the leap month.

It is not called the calendar, it is the scientific name of the Gregorian calendar, the calendar should be the lunar calendar, the two calendars are different in terms of calculation methods, the leap year of the lunar calendar is to use the leap year to adjust the twenty-four solar terms, the Western era is to adjust the date by increasing the number of days in a fixed month, this is done because the time of the earth's rotation around the sun and revolution is somewhat deviated, and the deviation is adjusted by leap year, so that the season will not jump between the months, with a fixed number of days, this spring is in January, and after a number of years, it will run to June.

In 2009 (twothousandandnine), a total of 365 days, 53 weeks. The Year of the Ox in the lunar calendar, leap May, a total of 384 days. The lunar calendar starts and ends on January 26, 2009 and February 13, 2010.

A common year is a year in which there are no leap days in the solar calendar, or there are no leap months in the lunar calendar. A year that is not a whole hundred divided by 4 or a year that is not a whole hundred divided by 400, if it is not divisible, it is a common year. February in a common year has only 28 days, while February in a leap year has 29 days.

It is a common year, not a leap year

To determine whether a year is a leap year, the general method is to divide the number of years in the year with 4 or 400, if the quotient divided is an integer and there is no remainder, then the year is a leap year.

When the Gregorian calendar year is a whole hundred, only look at the two digits of the number of years in the thousand and hundred, if these two digits are multiples of 4, the year is a leap year, otherwise, it is a common year.

In this way, you can quickly make a judgment just by doing oral calculations. For example, which of the following years are ordinary years? Which are leap years?

1936, 1958, 1984, 1997, 2000, 2600 years, because the last two digits of the years 1936 and 1984 are multiples of 4, so 1936 and 1984 are leap years.

The last two digits of the years 1958 and 1997 are not multiples of 4, so 1958 and 1997 are common years. Because the first two digits of the year 2000 are 20 is a multiple of 4, and the first two digits of the year 2600 are 26 are not a multiple of 4. So, 2000 is a leap year and 2600 is a common year.

The usual explanation is that there are many days, hours, and minutes in a year, and the whole number 365 is still superfluous, 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:

The Earth's orbit around the Sun is 365 days, 5 hours, 48 minutes and 46 seconds, 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 year that is not a multiple of 400, and even a multiple of 4 is not a leap year.

How to judge leap years:

1.Years divisible by 400;

2.Years that are divisible by 4 but not by 100.

A leap year is one that satisfies one of the above two conditions.

The 2009 lunar leap month is a leap month year in the lunar calendar. Although it is also called a leap year, it is not the same as a leap year as it is commonly referred to as a leap year.

A Gregorian leap year is a year divisible by 4, such as 2008. A leap year is a leap year that must be divisible by 400.

Leap years in the lunar calendar are mainly leap months, that is, there are thirteen months in this lunar year, one of which is called leap? month, generally ranked from February to October. A leap year in the Gregorian calendar is the 29th day of February.

Therefore, it is correct to ask whether it is a leap year not to say that "2009" is a leap year, but to ask whether it is a leap year based on the lunar calendar of that year, such as "Jiashen" and "Xinyou".

2008 is a leap year, which is also the year of Wuzi in the lunar calendar.

The year 2008 is a leap year, the year of the rat in the lunar calendar, and this year is also the International Year of Languages, the International Year of Earth, the International Year of Health, etc.

Major events have occurred such as China's successful hosting of the 29th Summer Olympics and Paralympics, the successful launch of the Shenzhou-7 manned spacecraft, and the Wenchuan Da**.

2008 is a normal year, and it is sufficient to determine whether it is a leap year divided by 4.

2008 4 = 502, 2008 is divisible by 4, so we can get that 2008 is a leap year.

The 2008 leap year is a leap year, not a common year (leap year determination method: divisible by 400.) Or divisible by 4 but not by 100. )

A leap year was established to compensate for the 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.

There are 366 days in a leap year in the Gregorian calendar (31 days, 29 days, 31 days, 30 days, 31 days, 31 days, 30 days, 31 days, 31 days, 30 days, 31 days, 31 days, and 31 days in a leap year in the lunar calendar because it is one month longer than a normal year (354 days), so it is actually 383 or 384 days (the specific leap month is determined by the solar terms).