If the sun had not revolved around the earth, how would humans define time20?

The sun does not revolve around the earth in the first place.

The rotation of the earth creates a division between day and night, and there are spring, summer, autumn and winter when it revolves around the sun.

Time is man-made, and this statement is true. All units of measurement are prescribed by people.

Time travel was impossible in Einstein's view, referring to his special theory of relativity.

If we do not rotate, the cycle of day and night will be one year, and in that case, it will be too hot in some places and too cold in others, and the entire global environment will be completely different from what it is now, and it is difficult to determine whether human beings will survive.

If we are still healthy, time is easy, and the year, month, and week have nothing to do with the rotation of the earth! At that time, people may continue to use the method of keeping time in the year and month. As for how to divide the month into a shorter period, it is the same as the week, and it is considered simpler and more practical to prescribe one.

The planet must revolve around a certain star.

If the Earth does not revolve around the Sun, it must revolve around other stars, and the way to define time will be similar.

There is currently no cosmic model in which planets do not revolve around stars.

The sun does not revolve around the earth.

There's no if, because it's the other way around.

It is the earth that revolves around the sun

If the Earth had not revolved around the sun, how would humans define time?

It can be said that it takes time to do anything, and the definition of time should be very simple

Regarding time travel, it can be said that it is easy to go to the future, but it is difficult to go back to the past.

If you want to go to the future, you can do an acceleration exercise, and the closer the speed is to the speed of light, the slower the passage of time becomes, and you can say that you have entered the future.

It can also be entered into the future by freezing for several years before thawing.

It's not so easy to go back in time. First of all, faster-than-light motion now seems impossible, and using wormholes to travel back in time requires negative energy matter, which is very dense in the universe and difficult to collect. Even with so much negative energy matter, the powerful force field created by the distorted space-time in the wormhole can destroy any object in an instant.

There are many other theories of this kind of problem, such as "two cosmic strings intersecting", "closing time-like curves", "rotating the universe as a whole", etc... I don't know that very well.

Hawking then proposed the "Time Preservation Hypothesis", which states that natural forces do not allow the construction of time machines to go back in time.

However, there are indeed unavoidable contradictions in returning to the past. That is, the history that has been frozen will be stirred again, and everything will become uncertain. There is no way around a paradox that time travel can't bypass:

Foresight of the future and the rebellion of free will. If you go back from time A to time B, then the history between AB is "already happening", which is theoretically known and definite for you; But you have free will, and you can force some change in this history based on what you know (otherwise why would you go back in time?). Then the history between AB is uncertain again, and the history that has been solidified is stirred.

This agitation leads to a more typical paradox: if you go back in time and kill your grandfather (or mom, dad, before giving birth to you, of course), how can there be a future one for you to do it?

Therefore, it is easy to go to the future, but it is not easy to return to the past.

It turns out that there are still people who believe in geocentrism.

Since time is defined by people, then you can touch the definition as you want! For example, the time it takes for a kilogram of object to fall from a height of 1m is called one second

The sun does not revolve around the earth in the first place.

If so, there would be no humans.

Big brother, the sun does not spare the earth to turn.

It takes the earth to rotate once in one day; Set the time it takes for the Earth to complete one revolution around the Sun as one year. The Earth rotates from west to east on its axis of rotation, rotating counterclockwise from the north pole and clockwise from the south pole.

The Earth's axis of rotation is angled to the ecliptic plane, perpendicular to the equatorial plane.

The Earth's rotation is an important form of motion of the Earth, with an average angular velocity of rotation in degrees and a linear velocity of 465 meters and seconds at the Earth's equator. It takes 23 hours and 56 minutes for the Earth to rotate around and increases or decreases by 3 to 4 thousandths of a second every 10 years.

The time it takes for the earth to complete one rotation is set at (1 day); The time it takes for the earth to complete one revolution around the sun is set at (one year).

24 hours.

365 days. Hope it helps.

Feel free to ask -

If you see the sun as completely stillWhen the earth revolves around the sun, your artificial celestial body can only rotate around the sun in order to ensure that the three objects are connected in a line......

And if you change the frame of reference and think of the earth and the sun as stationary, then you don't have this problem, and the artificial celestial bodies are completely stationary.

The earth must revolve around the sun, which is an objective law.

1. Characteristics of the Earth's rotation:

1) The direction of the Earth's rotation: from west to east. The north end of the Earth's axis always points to the North Star.

2) Period: The time it takes for the Earth to rotate once (360°). 1 sidereal day is 23:56:4. 1 solar day is 24 hours.

2. The direction, orbit, period, and velocity of the earth's revolution

1) Direction: from west to east. From the North Pole, the Earth orbits the Sun in a counterclockwise direction. It orbits the Sun in a clockwise direction as seen from the South Pole.

2) Orbit: Ellipse, the Sun is located on one focal point of the ellipse.

3) Period: A return year = 365 days, 5 hours, 48 minutes and 46 seconds, 365 days per year is the approximate value of the return year, and nearly 6 hours are thrown away in a year, so 4 years are a run, and a leap year is 366 days. (The annual movement of the sun is used as a reference).

1 sidereal year = 365 days, 6 hours, 9 minutes and 10 seconds (with stars as reference) (4) The speed of the Earth's revolution.

Angular velocity of revolution: It takes one year to make a 360° revolution around the Sun, and it is about 1° to the east every day.

Orbital linear speed: about 30 kilometers per second on average.

It is an objective law that the earth revolves around the sun.

In the debate on whether the earth revolves around the sun or the sun revolves around the earth, the following statements are correct:

a.Using the earth as a reference, the sun revolves around the earth's potato ball.

b.With the sun as a reference, the earth revolves around the sun of the Taiqi attendant.

c.Only the statement that the earth revolves around the sun is true.

d.Only the statement that the sun revolves around the earth is true.

Motion is relative, and if different references are used to determine who is moving and who is at rest, it is not necessarily who revolves around whom, both A and B are right.