Why is the extra day in leap years added to February?

Reason: Evolved from the ancient Roman Julian calendar.

Caesar decreed in his decree to change the calendar that there should be a leap year every three years, that is, a leap year every four years; 365 days per year in a normal year and 366 days a year in leap years. At that time, the 365-day month arrangement of the ordinary year was completely in line with human thinking, that is, according to the big month, the small month, the big month, the small month, the big month, the small month, the small month, the big month, the small month, the big month, the small month, the big month, the big month, the small month, the big month, the small month, the big month, the big month, the small

The big month is 31 days and the small month is 30 days, but after calculation, it was found that there were 366 days in such a 12 months, which is one day more than the actual 365 days. Therefore, it is necessary to reduce one day in a certain month, and in the calendar it is reduced in February.

A leap year is a year in which there are leap days in the Gregorian (Gregorian calendar) or summer calendar, and a leap month in the old Chinese lunar calendar.

The Earth's orbital cycle 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 it accumulates about one day every four years, and this day is added to the end of February (February 29), so that the length of the calendar year of that year is 366 days, and the year is a leap year. According to a leap year every four years, there are an average of more days per year, and after 400 years there will be about 3 more days, so every 400 years there will be a decrease of three leap years.

Therefore, it is stipulated that the Gregorian calendar year is a whole hundred, and it must be a multiple of 400 to be a leap year, and a multiple of 400 is a common year. For example, 1700, 1800 and 1900 are common years, and 2000 is a leap year. The calculation of leap years boils down to what is commonly said:

There is a leap in four years, no leap in a hundred years, and another leap in four hundred years.

It should be noted that the current Gregorian calendar is based on the Romans"Julian calendar"Adapted.

Since it was not understood at the time that there was an extra number of days to be counted each year, from 46 B.C. to the 16th century, a total of 10 days were accumulated. For this reason, Pope Gregory XIII at the time artificially designated October 5, 1582 as October 15. and began a new leap year rule.

Since then, the average daily length has been days, with a deviation of 1 day in about 3000 years.

February has fewer days, and for the sake of fairness, it should be added to February!

Because the number of days in February is already the same, for the sake of fairness, it is added to February.

It seems to be prescribed by a certain pope.

Here's why:

The earth we live on always revolves around the sun. It takes 365 days, 5 hours, 48 minutes and 46 seconds for the earth to complete one revolution around the sun, which is the day. In order to lack the imperial convenience, the year is set at 365 days, which is called a common year; In this way, every four years there is about an extra day, and if you add that day to February, there are 366 days in the year, which is called a leap year.

Leap years have 366 days. In the Gregorian calendar year, a year with a leap day is called a leap year, and the general year is 365 days, while a leap year has 366 days. The solar cycle is 365 days, 5 hours, 48 minutes and 46 seconds (conjunction), which is a return year, and the Gregorian calendar defines a year as 365 days.

The remainder of the year accumulates about one day every four years, and this day is added to February, so that there are 365 days in a common year, 28 days in February, 366 days in leap years, and 29 days in February, with an extra day.

Leap year month related:

Leap years January and December are 31 days, 29 days, 31 days, 30 days, 31 days, 30 days, 31 days, 31 days, 30 days, 31 days, 30 days, and 31 days.

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). Discredit.

Note that there is no direct correlation between leap year (noun in the Gregorian calendar) and leap month (noun in the lunar calendar), the Gregorian calendar is only divided into leap years and peaceful years, with 365 days in a common year and 366 days in a leap year (one more day in February); There may also be a leap month in a normal year (e.g. 2017 is a common year, and the lunar calendar has a leap month and a leap month).

The earth we live on always revolves around the sun. It takes 365 days, 5 hours, 48 minutes and 46 seconds for the earth to make one revolution around the sun's rocks, which is the day. For convenience, the year is set at 365 days, which is called a common year; In this way, every four years there is about an extra day, and if you add that day to February, there are 366 days in the year, which is called a leap year.

We usually say 365 days a year, in fact, it is an approximation, to be precise, the earth orbits the sun for 365 days, 5 hours, 48 minutes and 46 seconds, the number should be the day, that is, a return year, then a year 365 days, it is different from the actual year, the remaining time is about four years to accumulate the calendar day, so that after four years it is nearly one day less than the actual year, in order to make up for this difference before the obscuration, the calendar stipulates that 4 years set a leap, that is, the year that can be divisible by 4 is a leap year, and this year is a leap year.

In the current Gregorian calendar, there are 97 leap years every 400 years, according to the calculation of a leap year every four years, there is a leap year every four years, the time difference is not a full 24 hours, but 23 hours, 15 minutes and 4 seconds, so a leap in four years is calculated 44 minutes and 56 seconds, it seems that the error is very small, but the time is long, the error is large, every 400 years to calculate 3 more days 2:53 minutes and 20 seconds, so every 400 years should be less increase only 3 days and search, the average number of days per year should be calculated, This results in about three more days after four hundred years, and thus three leap years are reduced every four hundred years.

Precautions and key points for leap years:

Women drink leap month teaThere is a custom of drinking tea in leap month in the Wuyi Mountain area, and it is mainly women who drink tea, men cannot participate, and only women are eligible to sit at the table. The women of the peasant families in the village take turns to take turns to host the banquet and drink tea, and invite the female guests from the nearby village to the banquet. At the "tea banquet", tea is used instead of wine, tea is toasted to each other, and chatting while drinking can play a harmonious role and enhance the harmony of neighbors.

In Taiwan, there is such a custom in leap month: the daughter who has married out needs to buy a pair of pig's feet and noodles for her mother, usually two front pig's feet and six noodles, and the noodles are tied with red silk threads and spring flowers. In some areas, there is a custom of avoiding moving graves in leap months, saying that the leap month is an extra month, and the ghost door cannot be closed in this month, and those who die in the leap month must be buried in the next month.

Reference: Encyclopedia - Leap Year.

The reason for the extra day in leap years is that leap years have 366 days, which is one day more than in ordinary years.

The actual time for the Earth to orbit the Sun is 365 days, 5 hours, 48 minutes and 46 seconds. For convenience, a normal year is calculated as 365 days, so that every four years it is less than 5 hours, 48 minutes and 46 seconds. Therefore, an additional day is added in February of the fourth year, which is called a leap year (366 days).

Because every day every four years or so, the nuclear book is usually placed in the year when the number of years in the Common Era is divisible by 4. This is the principle of "every leap in four years".

In general, leap years are 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 artificial calendar, so they will have one more day than a normal year.

In leap years, when the jujube is withered, it should be counted as one more day, because the leap year is 366 days, and the year is divided into Iwahashi flat year and leap year, the leap year is 366 days, and the ordinary year is 365 days less than the leap year. So when a leap year comes, one more day should be counted.

384 days.

Xinhua News Agency, Tianjin, January 1 (Reporter Zhou Runjian) The year 2022 has passed, and a new 2023 has begun. According to astronomical science experts, 2023 is a normal year in the Gregorian calendar, with 28 days in February, and a total of 365 days in the year. The upcoming Year of the Rabbit in the lunar calendar is a leap year, with a total of 384 days in the whole feast year.

Zhao Zhiheng, a member of the Chinese Astronomical Society and a director of the Tianjin Astronomical Society, introduced that the Gregorian calendar and the lunar calendar have different historical origins and calendar systems. The Gregorian calendar has a leap year every 4 years. Normally, a leap year is a leap year in which the number of Gregorian years can be divided by 4, and February has 29 days; Except for the inexhaustible year, which is a normal year, February has 28 days.

The year 2023 cannot be divisible by 4, so it is a normal year with a total of 365 days.

February is only intercalary every 4 years. In the calendar, the Gregorian calendar appears every four years and has 29 days of February, which is a leap February.

There are two Februarys in a lunar year, and the second February is a leap February. The frequency of leap February is second only to leap March, and the frequency is medium around the 21st century, generally occurring once every 19 years (e.g., 2004, 2023). Since then, the frequency of leap February has gradually decreased to a rare leap month, which occurs once in each century in the 25th and 28th centuries, and there are no leap months in the 29th and 30th centuries, 36th and 38th centuries, and 40th and 44th centuries.

The reason for the February of a leap year is one more day than February in an ordinary year is the rotation of the earth.

The time is 365 days, 5 hours, 48 minutes and 46 seconds, but we stipulate that the length of the year is 365 days, so there will be a difference of one day in four years (5 hours, 48 minutes and 46 seconds 4 24 hours), so every four years we stipulate that an extra day is added to alleviate this error.

The Western lunar calendar has a "leap year", and the year with a leap day in the solar calendar is called a leap year, and the opposite is a common year, which is 365 days in a normal year and 366 days in a leap year. In the Gregorian calendar (Gregorian calendar.

In a common year, February is 28 days, and in leap years, February is 29 days. Leap day is celebrated on February 29 of a common month in leap years.

The current Gregorian calendar uses the year of return as the basis for calculating "years", and a year of return is approximately equal to days. 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.

How many days are there in February in a leap year How many days are there in February in a leap year? The year is divided into 12 months, and you have noticed that the number of days in February is sometimes 28 days, sometimes 29 days? This is the difference between leap years and peaceful years, so how many days are there in February in leap years?

How many days are there in February in leap years? Now, let's follow the perpetual calendar to understand how many days there are in February in leap years.

How many days are there in February in a leap year How many days are there in February in a leap year?

The Earth orbits the Sun at intervals of about a few days, and our calendar has only 365 days per year, which means that there is almost one more day on the calendar every four years. To account for this remainder, an additional leap state day is added every 4 years – February 29.

So there are 29 days in February in leap years.

Are you asking about the Gregorian calendar or the summer calendar? There are 29 days in February of the leap year of the Gregorian calendar, and there are 366 days in the whole year; The summer calendar has 354 days in a normal year, 383 days in a leap year, and a leap month.

The current calendar for leap years in the Gregorian calendar is:

Where the value of the year is divisible by 4 and not divisible by 100, it is a leap year, such as 2008;

Where the value of the year is divisible by 100 and not divisible by 400, it is not a leap year, such as 1900 and 2100;

Where the value of the year is divisible by 400 and not divisible by 3200, it is a leap year, such as 1600, 2000, 2400;

Any year whose value is divisible by 3200 is not a leap year, such as 3200. Start the trouble.