Why is there no 30th in February, and is there a 30th in February?

It is said that in the forty-sixth year BC, the Roman Emperor Caesar, when revising the calendar, stipulated that the year was twelve months, which.

January, March, May, July, October, and December are the big months, and the 31st day of each month; The other months are designated as small months, with thirty days per month. However, according to this rule, a year is not three or six or five days, so it is necessary to find a month to deduct one day. At that time, the prisoners sentenced to death were executed in February, so it was hoped that February would pass sooner.

So, I deducted one day from February. Thus, there are twenty-nine days left in February. Later, there was a man named August who became Roman emperor.

He found that Caesar was born in July and July in the great month, while he himself was born in August and August in the small month. In order to show that he had the same dignity as the previous emperor, he also designated the month of August as the Great Month, and changed it to the thirty-first day. The extra days in August are still deducted from February, so that there are only twenty-eight days left in February.

It's just that every four years, that is, leap years, February is twenty-nine days. This is where the low number of days in February comes from.

It was entirely man-made, as if the month in which the kings were born was originally 30 days, and in order to take 31 days, they took one day from each of February.

Yes, very few and irregular, if you look up February 1962, there is. I'm talking about the lunar calendar.

The Gregorian calendar we use today is derived from the Julian calendar. In 46 B.C., the Roman commander was Julius Caesar. It is said that his birthday was in July, and in order to show his greatness, he decided:

Will be called July"Julian", together with all the single months are set at 31 days, the double months at 30 days, and only February is 29 days in a common year and 30 days in a leap year. Because February is the month of executions, one day is reduced.

Caesar's heir was called Augustus, and his birthday was in August. The month of the birthday of a great man is only 30 days, so how can it be done? He decided to call August"Augustus Month", and change the month to 31 days.

Isn't this one day less? So I took another day out of February. Since then, there have been only 28 days in the common year of February.

The low number of days in February and the irregularity of the Gregorian months were caused by these two emperors of ancient Rome.

There is no 30th of February.

February is the second month of the Gregorian year, with 28 days in a common year and 29 days in a leap year. There have been 3 times in history, with 30 days in February. In the Northern Hemisphere, February is the third month of winter.

In the twelve earthly branches, the second month was built.

Mythological stories

The 365-day month arrangement in a normal year is completely in line with our thinking, that is, according to the big month, the small month, the big month, the small month, 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 small month, the right six big months and six small months.

The Gregorian calendar was established in 46 BC by Emperor Rosa. Originally, he set a year of 12 months, 31 days in a single month and 30 days in a double month, so that there were 366 days in each year. However, Rome at that time had to execute a group of prisoners every February, so February was considered an unlucky month.

As a result, Caesar reduced February by one day, leaving 29 days.

Later, Caesar was killed, and Augustus became emperor, and he found that Caesar's birth was born in July with 31 days, and his birth was only 30 days in August, so he subtracted one day from February to August. This leaves 28 days in February and 31 days in August.

At the same time, he changed the number of days in the following months, and it became like this. However, there is no other historical evidence for this, and it is likely to be just a myth, albeit a very old one.

?February is the second month of the year, and the number of days varies depending on the difference between a normal year and a leap year, and there have been three times in history when there have been 30 days in February.

In a normal year, February has 28 days, and in leap years there are 29 days, and the reason why February is different from other months when it has 30 or 31 days is that if we calculate the time of the year according to a day-night cycle, there will be a difference in the remainder of one day in a year.

The sun rises and sets in one day, and the earth rotates in one circle. This process lasts 365 times, which is one year, and the Earth revolves around the Sun for one week. According to careful calculations, the time to rotate one week is days, but for convenience, the calendar records only 365 days per year.

That's one more day every 4 years. On this day, the year was divided into ordinary and leap years.

This chronology, known as the Gregorian calendar, was used by the ancient Romans as early as 46 BC and was refined in later generations. Due to the limitations of measurement technology at that time, there was a certain amount of error, and three leap days were canceled every 400 years.

The consequence of this is that February 30 has occurred three times in history. At that time, the Roman Empire was ruled by Julius Caesar, and after years of wars and constant changes of rulers, the calendar was chaotic, and the emperor decided to reform the calendar and formulated a new calendar.

According to the calculation method at the time, there were 365 days per year in a normal year and 366 days per year in a leap year. A year is exactly six big months and six small months.

The big month is 31 days, the small month is 30 days, the February 29 days, the year is 366 days, in the ordinary year, one more day is taken from February, and then when people use this algorithm, there is a phenomenon that every 400 years of time does not match, and can only make up one day in February, there are three February 30 days.

1. The thirtieth of February is very special: because it rarely appears.

2. Now the post-00s people's birthdays are: February 30th of the lunar calendar; Gregorian Calendar Gregorian calendar: April 4, 2000. (Live happily and cherish it).

Lunar calendar: February 30, 2038, Gregorian calendar: April 4, 2038.

6. Note: The Gregorian calendar, that is, the Gregorian calendar: there are no 30 days in February, there are only 29 days in leap years, and there are only 28 days in ordinary years.

Generally, the dates used by various industries are: calculated according to the Gregorian calendar, which is what the common people call the Gregorian calendar.

Ordinary people generally calculate the date according to the lunar calendar. Generally, the date that grandparents and parents say is the number of lunar numbers. If you ask, just tell them according to the lunar calendar.

The lunar calendar is the lunar calendar.

The Gregorian calendar is the Gregorian calendar.

Always tell you for sure.

There is no number 30.

February in leap years has 29 days; There are 366 days in a year.

There are 28 days in February in a normal year.

There are 365 days in a year.

There are some months in the lunar calendar that do not have the 30th day, which is determined by the compilation method of the lunar calendar. The length of the calendar month of the lunar calendar is based on the synodic month, the big month is 30 days, and the small month is 30 days.

With 29 days, the major and minor months make up for each other, bringing the average length of the calendar months close to that of the synodic months.

The lunar calendar regularly regards the day of the new year as the first day of the month and the first day of the new year. The so-called "Shuo", astronomically speaking, it has a definite moment, that is, the moment when the lunar longitude and the solar yellow longitude are the same. As for the basis for determining the names of the months in the lunar calendar, it is determined by "Zhongqi".

That is, the month containing "rain" is January; February is the month containing the "vernal equinox"; The month containing "valley rain" is March; With the inclusion of "Xiao Man."

The month of April is April; The month containing the "summer solstice" is May; The month containing the "Great Heat" is June; The month with "heat" is July; The month containing the "autumn equinox" is August; The month with "frost" is September; With the word "light snow."

The month of October is October; The month containing the "winter solstice" is November; to contain "heavy snow."

The month of December is December.

There is no 30th of February. February is a small month, there are 360 days in a year, there are 12 months, the month is divided into a large month and a small month, and the year is divided into a leap year and not a leap year, and there is a leap year every four years, but in February, whether you are a leap year or not, there is no 30th, and there are 29 days in a leap year in February, and there are 28 days in a leap year, and February is a small month, so there is no 30th in February.

There is no reason for the 30th in FebruaryThere is a February 30th in the lunar calendar, and there is always a 30th day in the second month of the Chinese calendar. Originally, there were 30 days in the second month of the Roman calendar, but in 46 BC, the birthday of Julius Caesar, the commander of Rome, was in July, and in order to show his greatness, he decided to call the month of Julian Julian, together with all the single months as 31 days, and the double months as 30 days, only February was 29 days in ordinary years and 30 days in leap years. Because February is the month of executions, one day is reduced.

Caesar's heir was called Augustus, and his birthday was in August. The month of the great man's birthday was only 30 days, so he decided to call August the month of Augustus, and changed the month to 31 days, and the month to 30 days. This was not a day less, so another day was taken out of February.

Since then, there have been only 28 days in the common year of February.

The 30th of February is likely to occur.

The calendar used today evolved from the ancient Roman Julian calendar. By 46 B.C., the calendar was in disarray, so Julius Caesar, the ruler of the Roman Empire, decided to reform the calendar and create a new calendar, which was called the 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 our thinking, that is, according to the big month, the small month, the big month, the small month, the big month, the small month, the big month, the small month, the big month, the small month, the big month, the small month, the small month, the right six big months and six small months.

Of course, the big month is 31 days and the small month is 30 days, but after calculation, it is not difficult to find that such a 12 months have a total of 366 days, which is one day more than the actual 365 days. Therefore, if you want to reduce one day in a certain month, you can see that in the calendar, this day is reduced in February.

In the time of Pope Gregory I, it was discovered that every four years was a little too much, and the most correct way would be to have a leap every four years, but not every 100 years, for example, years, but every 400 years, another day of leap, for example.

No, February usually has only 28 days, unless it's a leap year, then February will have 29 days. The rule for leap years is that there is a leap every 4 years, except that years divisible by 100 are not intercalary, and years divisible by 400 are intercalary.

For example, this year, 2021, is not a leap year, so there are only 28 days in February; And next year, 2022, will not be a leap year, it will also have only 28 days; But 2024 is a leap year, with 29 days in February. To add that the rules for leap years are based on the Gregorian calendar, which is the most widely used calendar in the world. The Gregorian Calendar was established by Pope Gregory XIII in 1582 to replace the Julian calendar.

In order to solve the problem of the spring equinox moving forward due to the Julian calendar, the Gregorian calendar provides for a leap day every 4 years, but does not intercalate in years that are divisible by 100 but not by 400. For example, 1900 is not a leap year because it is a year divisible by 100 but not by 400; And the year 2000 is a leap year because it is divisible by 400. The purpose of this rule is to prevent leap seconds from appearing in the system, as leap seconds can cause errors in the computer system.