Why is there a distinction between a common year and a leap year?

The Chinese lunar calendar has leap months, which are set to adjust the gap between the return year and the synodic months of the lunar calendar, and the years with leap months are called "leap years". But the landlord's problem is "leap year" and "common year", which is the regulation of the Gregorian calendar, and the lunar calendar does not have a common year. A year in the Gregorian calendar with a leap day is called a leap year, and the opposite is a common year, with a normal year of 365 days and a leap year of 366 days.

In the Gregorian (Gregorian) calendar, February is 28 days in a common year and 29 days in a leap year. Leap day is celebrated on February 29 of a common month in leap years. Reasons for the addition of leap days The current Gregorian calendar uses the return year as the basis for calculating the "year", and a return year is approximately equal to the day.

Since only 365 days are counted in the Gregorian calendar in ordinary years, the result is that after four years, the days will be accumulated, which is approximately equal to one day, so a leap day is added every four years to offset this day. Method of calculating leap years In the Gregorian calendar chronology, most of the years that are divisible by 4 are leap years, the years that are divisible by 100 but not divisible by 400 are not leap years, and those that are divisible by 3200 are not leap years, such as 1900 is a common year, 2000 is a leap year, and 3200 is not a leap year.

Because the time of day is not actually 24 hours. It is more than 23 hours 59 minutes. Then every four years, it adds up to one day. So every 4 years there are leap years. There are 29 days in February, 365 days in the year.

A leap year has 366 days, one in 4 years, the calculation method: divide the number of years in the current year by 4, if there is no remainder, then that year is a leap year, otherwise it is not. For example, if 2008 is a leap year, divide by 4 and there is no remainder.

A leap year is a year in which there is a leap day in the solar calendar (i.e. 29 days in February) or a leap month (13 months in a year) in the lunar calendar. 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.

1) The intercalary base year in the Gregorian calendar The earth's orbital cycle around the sun is 365 days, 5 hours, 48 minutes and 46 seconds (conjunctive days), that is, a tropical yearThe common year of the Gregorian calendar is only 365 days, which is shorter than the return year, and it accumulates about one day every four years, and this day is added to the end of February (that is, February 29), so that the length of the year becomes 366 days, and the year is a leap year. The calculation of leap years boils down to what is commonly said:

a leap in four years; There is no leap in 100 years, and then in 400 years. (2) Leap year in the Chinese lunar calendar As a species of the lunisolar calendar, the number of days in the month is determined according to the monthly deficit, and the time of the year is based on 12 months, and the common year is about 11 days less than the return year. In order to coincide with the Earth's cycle around the Sun, i.e., the return year, one month is added every 2 to 4 years, and the additional month is a leap month.

The month to which the leap month is added is inferred from the rules of the lunar calendar, and is mainly determined according to the correspondence with the 24 solar terms of the lunar calendar. There are 13 months in a year with a leap month and a calendar year length of 384 or 385 days, which is also known as a leap year. For example, in the lunar calendar of the Year of the Rat in 1984, there were two Octobers, which usually became the first ten months of the month and the last month (i.e., the leap month).

The calculation of leap months in leap years in the lunar calendar is one leap in 3 years, two leaps in 5 years, and seven leaps in 19 years; 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.

Summary. 1. A common year refers to a year without a leap day, which is established to make up for the time difference between the number of days of the year and the actual orbital period of the earth caused by the provisions of the artificial calendar, with a total of 366 days; 2. February in a common year has 28 days, while February in a leap year has 29 days; 3. Leap years are divisible by 4, while ordinary years are not divisible by 4.

1. A common year refers to a year without a leap day, which is established to make up for the time difference between the number of days of the year and the actual orbital period of the earth caused by the provisions of the artificial calendar, with a total of 366 days; 2. There are 28 days in February in ordinary years, and 29 days in February in leap years; 3. Leap years are divisible by 4, while ordinary years are not divisible by 4.

Is there anything else you need.

A common year is a year in which there are no leap days in the solar calendar or no leap months in the lunar calendar. A leap year is a year in Common D.D. that is divisible by 4, but a year of a whole hundred (0 for single and ten) must be divisible by 400 (e.g. 1900 is not a leap year), and the others are common years.

For example, 1997 is a normal year and 2002 is a normal year; Mori Shihiro 1996 is a leap year, and 2000 is a leap year. February in a common year has 28 days, while February in a leap year has 29 days.

The Gregorian calendar has 366 days in a leap year, with 29 days in February; The solar calendar has 365 days in a normal year and 28 days in February.

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.

This is related to the lunar calendar, and the agricultural time in agriculture is formulated in accordance with the Gregorian calendar and the lunar calendar that are now commonly used in our country. The Gregorian calendar has 365 days in a year, and in leap years it is 366 days, because there are only 28 days in February in a normal year and 29 days in February in a leap year. The lunar calendar has only 354 or 355 days per year; In a year with a leap month, there are 384 or 385 days.

Because the lunar calendar generally has only 29 or 30 days per month, there is an extra month in a year with a leap month.

Because every time the earth revolves around the sun is a day, and a leap year is a leap every four years, the four multiplied together are equal to 1So there will be leap years.

Why are there common years and leap years?