The Moon is in the Earth s synchronous orbit, but why doesn t the Moon move synchronously with the E

The Moon is too light compared to the Earth, and the Moon's rotation energy is much smaller than the Earth's rotation energy, and the past time is not enough for it to have such an impact.

If the Earth-Moon system is not completely destroyed by the red giant Sun and is not destroyed by the impact of other celestial bodies, the Moon, which is significantly away from its current orbit in 50 billion years, can tidally lock the Earth as well. Then, under the influence of the white dwarf Sun, the Moon will gradually move closer to the Earth and allow the Earth's rotation to accelerate again.

Because the mass of the earth is much larger, but in fact, the moon is indeed locking the earth, the rotation of the earth at the time of the birth of the earth, scientists estimate that it is only 6 hours, and the moon has been rubbing through tidal forces for billions of years before it becomes 24 hours now.

So if it continues, the Earth's day will become longer and longer until the Earth-Moon systems lock into each other. The Moon no longer rises in the east and sets in the west, but is forever fixed in a corner of the sky. But the problem is that this mutual locking is at least tens of billions of years away.

And the life span of the sun is only 5 billion years, so this is almost never possible.

Now the distance between the moon and the earth is getting farther and farther away, not closer and closer. And if this continues, sooner or later the Moon will one day become a geostationary satellite of the Earth. By that time, although the Moon will not be far away, the Earth's rotation will be more than 1,310 hours!

That's about 55 days now. And then the tidal phenomenon of the Earth will be much smaller than it is now, because the gravitational pull of the Moon on the Earth will be much smaller at this time. And since the Moon is too far from the Earth.

The distance between the Moon and the Earth is close to a certain extent, but it is closely related to their mass, density, etc., and their gravitational pull is also different, so it is unlikely that they will rotate together.

The Moon has a rotation, because it is locked by the tidal force of the Earth, so one side is always facing the Earth, which means that its rotation is almost synchronized with the Earth, and the Moon and the Earth are wound around a common center of mass, which is 1000 kilometers from the center of the Earth.

I think it's the reason for the distance from the sun, the reason for gravity.

This is the reason for gravity, the mass of the earth and the mass of the moon are different, and the distance from the sun is also different, so it does not move synchronously.

Because of the difference in gravitational force, the motion caused by different forces is also different.

This has to do with the gravitational pull of the Earth, which affects the movement of the Moon.

Because this is the reason why there is gravity between objects, and the difference in gravity determines the use of motion.

It could be the cause of the Earth's gravity, or it could be the cause of the volume.

It is because of the gravitational force between objects, the gravitational force is different, and the way of motion is also different.

A lot of factors, quality, distance, etc. are the key factors.

What you're saying is that the Moon's revolution around the Earth is the same as the rotation period of the Moon itself, so the Moon surface that we can see is basically only half the size of the Moon. For the Earth, it is to compare the period of the Earth's rotation with the period of the Earth's revolution around the Sun. That is, 1 day and 1 year.

This is a question of dynamic evolution in celestial mechanics. It is difficult to say the specific results, but it can be said that the rotation periods of the main star and the satellite tend to be the same under long-term evolution. For the Earth-Moon system, it has evolved to this point; For the solar-terrestrial system, it has not yet arrived.

Synchronization is a relative concept!

A "solar eclipse" can occur when the Moon moves halfway between the Sun and the Earth.

The moon moves between the sun and the earth, and if the three are exactly in a straight line, the moon will block the sun's light from the earth, and the dark shadow behind the moon will fall on the earth, and a solar eclipse will occur.

However, there is an angle of about 5 degrees between the lunar orbit and the earth's orbit, so not every time the moon moves between the sun and the earth, the moon will block the sun's light from the earth. In most cases, the shadow behind the Moon does not fall on Earth, and a solar eclipse does not occur.

The principle of the occurrence of a solar eclipse.

There is an angle between the orbit of the Moon and the orbit of the Earth.

1. New moon (the first day of the lunar calendar, that is, the new day): 0 degrees;

2. Shangemei month (generally around the second night of the lunar calendar --- about the seventh day of the lunar calendar): 0 degrees --- 90 degrees;

3. First quarter moon (around the eighth day of the lunar calendar): 90 degrees;

4. Gibbous Moon (around the ninth day of the lunar calendar --- about the fourteenth day of the lunar calendar): 90 degrees --- 180 degrees for burial;

5. Full moon (looking at the moon, around the 15th or 16th day of the lunar calendar): 180 degrees;

6. Gibbous Moon (about the 16th lunar --- 23rd of the lunar calendar): 180 degrees--- 270 degrees;

7. The second quarter moon (around the 23rd lunar month): 270 degrees;

8. Xiaemei month (around the end of the --- month around the 24th lunar calendar): 270 degrees--- 360 degrees; In addition, the last day of the lunar month is called the obscure moon; , i.e. missing.

From the title, we can always only see one side of the moon on the earth, because the period of the moon's revolution around the earth is equal to the period of rotation, that is, with a certain point on the moon as a reference, the position of the whole earth relative to the moon has not changed, so it is stationary, that is, the rotation around the moon cannot be seen Because although the entire position of the earth remains unchanged with the moon, the earth itself is rotating, that is, it always changes the side towards the moon Therefore, the astronauts who landed on the moon looked at the earth on the moon. It will be seen that the Earth only rotates, and there is no rotation around the Moon Option c fits the topic

Therefore, C

bThe time for the earth to rotate is exactly as the moon to rotate, so astronauts always see the front of the earth, so it seems that the earth will not rotate.

On the earth, you can see the moon rising in the east and setting in the west, and on the moon, you can also see the earth rising and setting, so it seems that the earth is revolving around the moon, which is the same as Copernicus's geocentric theory that the sun revolves around the earth.