On the same place on the Earth towards the side of the moon is not constant

Because the moon is subjected to the gravitational pull of the earth for a long time, its rotation period and revolution period are strictly equal, so the moon always faces the earth on one side. That is, only one side of the Moon can be seen from Earth. But after all, the Moon is smaller than the Earth, so the surface of the Moon will be slightly different when viewed from different positions on the Earth, which is called balance motion.

About 59% of the lunar surface can be seen on Earth.

Of course not. The Earth's rotation period is different from that of the Moon.

So what you see every day is of course different 0

The gravitational attraction between the Earth and the Moon is responsible for the tidal phenomena on the Earth's surface. The effect that this force produces on the Moon is tidal locking: the Moon's rotation period is as long as it takes to orbit the Earth. As a result, only one side of the Moon can always be seen on Earth.

The asymmetrical gravitational interaction also synchronizes the moon's rotation. For example, its orbital phase is always relatively fixed, so that the side facing the Earth remains the same. Since the Earth's rotation was slowed down by the Moon's influence, the Moon's rotation was slowed down by the Earth a long time ago, but at that time the forces were much stronger.

When the rotation speed of the Moon slows down to the point where it is suitable for its orbital period (so that the point of expansion is directly opposite the Earth), there is no excess torsion, and the situation on the Moon is stable. This happens similarly with other moons of the solar system. Eventually, the Earth's rotation will also be slow enough to fit the lunar cycle, as was the case with Pluto and Charon.

Not the same.

Because the moon is revolving around the earth, the earth still has a rotation, for a certain point on the earth, the position of the moon has been changing, so the moon phase has been at the point, and because the earth's rotation cycle, and the moon's rotation cycle around the earth is also certain, the moon's orbit period is 28 days, so the moon phase always repeats every 28 days.

Strictly speaking, the degree of roundness is different, but it is basically invisible to the naked eye.

The moon seen at the same moment from different locations will indeed be slightly different. After all, the Moon is only about 380,000 kilometers away from the Earth, and the diameter of the Earth itself is more than 10,000 kilometers. So at the same moment, from south to north, from east to west, almost half of the people on the earth look at the same moon, and the difference in viewing angle is less than 2 degrees.

The Moon will only face the Earth on one side, and this is because it is tidally locked by the Earth.

for the sake of it. Under the pull of the earth's gravity, the moon is like a small ball tied to the earth with a rope, and can no longer rotate autonomously, so only one can face the earth with one side.

In such a state, the Moon.

Orbiting the Earth.

At the same time, it will also rotate itself, which means that the time for the Moon to revolve around the Earth is the same as the time for its own rotation, which is one month. And the earth rotates.

One circle is one day, and one circle around the sun is a year of dry potatoes, and the time difference is very large.

The rotation and revolution of the Moon are introduced as follows:

The rotation of the moon。The cycle is, this is exactly a constant moon, so we can't see the back side of the moon. This phenomenon, which we call "synchronous rotation", is almost a universal law in the satellite world.

It is widely believed that this is the result of the long-term tidal effect of planets on moons. Balancing movement is a wonderful phenomenon that allows us to see the Moon at 59. There are mainly the following reasons:

1) In different parts of the elliptical orbit, the rotational speed does not match the rotational angular velocity.

2) The intersection of the white road and the equator.

The mystery of the moon's rotation. The exploration of rotation was inspired by the method used to calculate the mobility of planar members in the principle of "mechanical design". This can be proven by:

1) Both the Earth and the Moon are celestial bodies that revolve around their respective axes. At this point, the Moon's activity is greater than zero, and the Moon can rotate around its own axis.

2) Suppose the "Earth" is a sleeve that can rotate relative to the center of the Earth, and then use a long rod to weld the Moon and the sleeve together. At this point, the activity of the Moon is equal to zero, but with the rotation of the sleeve (i.e., the relative rotation of the stars), it can rotate around the Earth.

3) Suppose the Moon is welded directly to Earth with a long rod. At this point, the motion of the Moon around its own axis is equal to zero, it cannot rotate around its axis, nor can it rotate relative to the Earth, but only "rotates" with the Earth.

3.Considering the above two cases2, the Moon rotates around the Earth's axis, but it cannot rotate, it appears to be facing the Earth. From a logical point of view, it is incorrect to call this "rotation" the rotation of the Moon in space.

In both cases, the Moon will not rotate relative to the Earth or relative to the stars.

4.It is fair that two rotating bodies rotate around their respective axes with respect to each other. There is no one around the other axis (rotation) to achieve rotation.

Therefore, only the first case can be used to indicate that the Moon rotates around its own axis. The Moon revolves around its axis, both with respect to the Earth and the Sun. It's just that it's not easy to notice because of its rotational eccentricity and rotational correction offset.

Revolution of the Moon. When the Moon rotates, the center of gravity is deflected under the action of centrifugal force, but the gravitational force is deflected inward under the gravitational force of the Earth. Under the action of these two forces, the Moon rotates around its own axis.

The Moon actually revolves around the Earth on its own axis. Therefore, whether using the Earth as a reference or a star as a reference, the Moon rotates with respect to the Earth.

6.The Moon rotates from west to east. The Moon rotates counterclockwise around the Earth when viewed from the North Pole of the Earth, and the Moon rotates clockwise around the Earth from the South Pole of the Earth. The revolution period is 30 days.

This is because the Moon's rotation period is equal to its orbital period, which means that it needs exactly one revolution for each revolution. This phenomenon is called"Synchronous rotation", causing the Moon to always face the Earth on the same side. In this process, the gravitational tidal force generated by the Earth on the Moon also plays a key role, which makes the Moon's rotation gradually slow down and finally stay in its current position.

Because it is a tidal lock phenomenon. Hundreds of millions of years ago, the rotation period of the moon and the revolution period are not the same, the tidal force generated by the earth on the moon in the moon chain blue ball formed a tidal friction phenomenon so that the rotation of the moon gradually tends to be synchronized with the revolution, to today the moon's rotation period and rotation period are the same, the moon revolves around the earth, and it itself also rotates without a cycle, so the moon always only has the same side towards the earth.

Tidal locking is generally just for large bodies to small bodies. In the pair of celestial bodies of the Earth and the Moon, the Earth is large and the Moon is small, so it is mainly the Tidal Locking of the Earth to the Moon. The Earth has a gravitational pull towards the Moon.

The Moon is a sphere with different distances from the Earth at different points on the surface, and therefore has different gravitational pull from the Earth. The closer the distance, the stronger the gravitational pull. So it's always the point on the Earth-Moon line that has the strongest gravitational pull, and so that point (always the point facing the Earth) protrudes towards the Earth under gravity, and it's a tiny protrusion, but it's working.

When this point is turned, the Earth's gravitational pull is still at work, pulling the protruding point back, preventing it from turning in the other direction, thus forming a moment. The direction of this moment is always opposite to the direction of rotation of the moon and is preventing the moon from rotating. Over time, the Moon's rotation speed will become slower and slower, eventually slowing its rotation speed to the same as its orbital speed.

At this time, the moment of the stool lift disappears, the force that prevents the moon from rotating is gone, and the rotation speed of the moon is stabilized. At this time, we say, "The Moon is tidally locked by the Earth". Compared with other planets and satellite systems, the Moon, as a satellite, has a relatively large mass, so the Moon also has a tidal locking effect on the Earth.

Geological surveys have found that in ancient times, the earth rotated much faster than it does now, with more than 400 days a year. Also because of the tidal lock-in of the Moon to the Earth, the Earth's rotation has also slowed down, and now there are only a little more than 365 days in a year. In the future, the Earth's rotation will slow down and the number of days in a year will decrease.

Looking at the moon from the earth, we can only see one side of it, and the other side of it is like a shy Li lead, always "hidden" from us. With the progress of astronomical observation methods, people have a relatively clear understanding of the side of the moon towards the earth, but they know very little about the side of its "hidden".

Now, people use manned or unmanned spacecraft to orbit the far side of the moon, take a picture of the far side of the moon, and then use radio waves to transmit it back or bring it directly back to the ground, and then know what it looks like. The terrain on the far side of the moon is more uneven and undulating than on the front side. Plains occupy less area, whereas craters have more.

Why does the moon always face the earth on the same side and never turn the other side?

This is because the moon revolves around the earth on the one hand, and on the other hand, it rotates once, and the time it takes to make one revolution is exactly the same as the time it takes to make one revolution around the earth, which is a day. So, when the Moon rotates around the Earth at an angle, it also rotates itself at exactly the same angle, and if the Moon rotates around the Earth 360, it also rotates exactly once, always with one side facing the Earth and the other side facing away from the Earth.

Because the Moon moves around the Earth in an elliptical orbit, its orbital speed is not as uniform as its rotational speed, and its axis of rotation is not perpendicular to the orbital plane of its rotation, so we can sometimes see a small part of the far side of the Moon. In this way, we can see about 59% of the moon's surface.

As for the fact that the rotation period of the moon is equal to the revolution period, it has not always been like this. Billions of years ago, the Moon's rotation was much faster than it is now, and due to the strong attraction of the Earth, the Moon's rotation has gradually slowed down until today it is exactly equal to its orbital period.

In the future, the Moon will gradually move away from the Earth, its orbital period around the Earth will become longer, and the Earth's rotation period will also become longer. In about 5 billion years, one day on Earth will be equal to the time it takes for the Moon to orbit the Earth, that is, one day is equal to one "month", which is equivalent to 43 days today. At that time, the earth will face the moon in the same way, and the moon will face the earth in the same way, and people who live on the moon side will have to travel a long way to the moon side to see the bright moon.