There are only 24 hours a day

I think there were only about 23 hours and 56 minutes in a day.

But the time is so long, how to use is different for everyone, Ling Hu Chong said in "Smiling Proud Jianghu": Some things are beyond our control, so we can only control ourselves. Since the time of day can't be changed, all we have to think about is how to use it and how to enjoy it, right?

It's up to you to decide how fast or slow the time is!

At present, many of the commonly used units of time are related to astronomical phenomena, such as a year (the earth revolves around the sun) and a month (the moon revolves around the earth); However, there are also many things that have nothing to do with astronomy, and are purely formulated because of certain human factors, such as folklore, politics, religion, etc., such as seven days a week, 24 hours a day, etc., which have nothing to do with astronomical phenomena. We generally think of the system of dividing the day into 24 hours as an Egyptian invention.

Because it takes about 24 hours for the Earth to rotate around in one cycle! As for why it takes 24 hours for the earth to rotate around for a week, you have to be the mother of the earth! Ho ho.

It's not equal to 24 hours, but what is the specific number behind I forgot too, you have to ask the seniors who opened this 24 hours.

The speed of time is not related to how many hours, but to what you do, if you don't have anything to do, the time is fast, if you live a fulfilling point, especially do something you don't want to do, you will find that time is so slow Hehe, the psychological effect determines your time!

You ask why it takes so long for the Earth to rotate for one week.

Because that's man-ruled, you can make it 48 hours if you become the boss of the world!

You ask this kind of question, it seems that you are boring enough! Rattle!

It has to do with the trajectory between the Sun and the Earth.

Let's move the West by convention! It's like 1+1=2

The one-hour time period is artificially determined, and the Earth's rotation is just under 24 hours.

The Earth's rotation period is 24**.

The rotation of the Earth is 24 hours.

Because twenty-four hours is a day.

Because the earth rotates in a twenty-four-hour clock.

The 24-hour day is 1440 minutes and 86400 seconds, because the conversion rate between hours, minutes, and seconds is 60. Using multiplication, the column formula can be obtained: 24 hours = 24 * 60 = 1440 minutes.

And because 1 minute = 60 seconds, using multiplication, the column formula can be obtained: 24 hours = 24 * 60 * 60 = 86400 seconds, so there are 1440 minutes in 24 hours, 86400 seconds.

The day is divided into twelve hours.

The ancients divided the day into several periods according to the sky, such as the dawn of the day, the sunrise for the morning, the sun in the middle of the day, the dusk after sunset, the night called supper or night, and so on. Later, the day and night were divided into twelve equal parts, that is, twelve hours. Left Pass?

In the fifth year of Zhao Gong, Du pre-"Note", which contains the complete names of the twelve hours, is: midnight, chicken, Pingdan, sunrise, eclipse, mid-day, mid-day, sunset, sunset, sunset, sunset. When did the twelve hours begin?

According to research, it began in the Mo Dynasty. During the reign of Emperor Wu of the Han Dynasty, the twelve earthly branches represented the twelve hours, replacing the original midnight, chicken woo, and Pingdan ....... Each hour is divided into two hour segments, such as the beginning of the child and the positive of the child, and the ugly hour is the beginning of the ugly and the ...... of the ugly.

In this way, the 12 o'clock of the day and night is subdivided into 24 hours, which is exactly the same as the current usage. For example, the sub-hour is from 11 o'clock to 1 o'clock at night, the ugly hour is from 1 to 3 o'clock, the second hour is from 3 to 5 o'clock, and so on.

However, the concept of the twelve o'clock is still used in later generations. People often refer to the fifth watch. What is the fifth watch?

The ancients often used the unit of five watches to divide the night into five watches, and each watch was about one hour. The first change (one change) is equivalent to the time of the 戌, the second watch is equivalent to the time of Hai, the third watch is equivalent to the time of the child, the fourth watch is equivalent to the ugly time, and the fifth watch is equivalent to the time of Yin. In the past, there was a more drum tower in the Forbidden City of Beijing, and the drum tower whined 108 bells after dusk and then got up.

Nanjing, Xi'an, Tianjin and other cities also have drum towers, and every night there are watchmen who tell the time according to the time indicated on the drum tower, which can be said to be a manifestation of preserving old habits.

Comparison table of the twelve hours and modern time periods.

In the middle of the night, the chicken whined, the sunrise and the eating time of the day, the middle of the day, the middle of the day, the sunset, the sunset.

At twelve o'clock, the son of the ugly Yin and the afternoon of the morning did not apply for the unitary of the sea.

Zichu Zi Zheng Chou Zheng Chou Zheng Yin Chu Yin Zheng Mao Chu Mao Zheng Chu Chen Chu Chen Zheng 巳初 Noon 正 未初 未正 Shen Chu Shen Zheng 酉初 酉正 戌初 戌初 海初 Hai Zheng.

Modern hours: 23 o'clock, 2 o'clock, 3 o'clock, 4 o'clock, 5 o'clock, 6 o'clock, 7 o'clock, 8 o'clock, 9 o'clock, 10 o'clock, 11 o'clock, 12 o'clock, 13 o'clock, 14 o'clock, 15 o'clock, 16 o'clock, 17 o'clock, 18 o'clock, 19 o'clock, 20 o'clock, 21 o'clock, 22 o'clock.

24 o'clock, 1 o'clock, 2 o'clock, 3 o'clock, 4 o'clock, 5 o'clock, 6 o'clock, 7 o'clock, 8 o'clock, 9 o'clock, 10 o'clock, 11 o'clock, 12 o'clock, 13 o'clock, 14 o'clock, 15 o'clock, 16 o'clock, 17 o'clock, 18 o'clock, 19 o'clock, 20 o'clock, 21 o'clock, 22 o'clock, 23 o'clock.

There are two types of "days": one is called a "sidereal day", which is the time it takes for the Earth to advance 15° in its orbit as it orbits. The day is 23 hours, 56 minutes and 4 seconds.

It is calculated as a sidereal day from the time when a star passes through a certain meridian on the earth until a star reaches this meridian again.

The second is the "mean solar day". The so-called solar day refers to the time it takes on the ground from noon to the second noon (it can also be counted from midnight to the next midnight). Since the speed of the Earth's orbit varies from day to day, the length of each solar day is also unequal to each other (although the sidereal days are equal each day, they do not apply).

Therefore, astronomers refer to the average solar day of a year as the average solar day, or "mean solar day". The mean solar day is 3 minutes and 57 seconds longer than the sidereal day. Nowadays, all the days used in various countries are ordinary solar days.

The sidereal day is only used in astronomical work, and the "day" we use in real life refers to the cycle of day and night, which is obviously closer to the true solar day. The time system based on the true solar day is called "true solar time".

The Earth's rotation is about 24 hours (science).

Day and night = 24 hours (equivalent substitution).

One day = 24 hours (ditto).

Because the time for the earth to rotate once is 23 hours and 54 minutes, which is about 24 hours.

, it will be slower and slower in the future, and it may appear more than 50 hours and more than 100 hours.

Twenty-four hours in a day, 672 or 696 or 720 or 744 hours in a month, 24*28=672

Hello, landlord.

First, no one can doubt that the day is 24 hours, but NASA research has found that the average length of daylight on Earth is now 1,1400 seconds longer, and the average day and night is 1,700 seconds longer. This auspiciousness accumulates by half a second each year, and after 120 years it will be one minute longer each day, and after a few centuries, the day will be more than 24 hours.

Second, the movement of the earth is changeable and extremely unstable. Scientists have analyzed many fossilized polyps and learned from the rings and growth lines that 100 million years ago, the year on Earth was 395 days, and the day was only 23 hours.

Third, 400 million years ago, there were 405 days in a year, and there were only 21 days in a day. 5 hours, 600 million years ago, no less than 425 days in a year, a day is only 20 hours. Scientists believe that the 1 day and night increase is due to the slowdown in the Earth's rotation.

Most scholars believe that it is due to the frictional force of high tides.

Fourth, it slows down the Earth's rotation.

Japanese scholars believe that the magnitude of the frictional force of the high tide is related to the distribution of the continents, and that the continents between 500 million and 300 million years ago were arranged along the equator, and the friction generated by the high tide is relatively large, and the rotation of the earth slows down relatively rapidly. After 200 million years ago, the continents were arranged in a north-south direction, and the friction caused by the high tide was relatively reduced, and the speed of the Earth's rotation slowed down.