What does the moon revolve around? How long is a rotation cycle? What about a year?

The universe is a very living environment, and the moon revolves around the earth for a period of 30 days, and the moon can be seen at the full moon in the middle of the month.

Many people have heard of myths and stories that Chang'e will find that the place where the moon is located is called the moon, and the moon revolves around the earth, and when the moon revolves around the earth, this time is called the moon's orbital cycle. The relationship between the earth and the moon is very mysterious, and it also constitutes the earth-moon system, although this system is the lowest, but the moon is also a natural satellite of the earth, their orbit is elliptical, and the rotation period is exactly the same as the earth's orbital period, so when people see the moon, they can not see a sphere, only a surface of the moon.

There are two points in the Earth-Moon system, one is perigee and the other is apogee, and when people are at perigee, they can't see the super moon. There are some similarities with the Earth-Moon system, that is, the Earth also revolves around the Sun, and the rotation period is also fixed. The orbit period is also fixed, the orbit is also nearly elliptical shape, and there are also perihelion and aphelion points that can be seen at a certain angle when the orbit of motion forms an angle, and such an angle is also called the yellow-red angle.

Eventually, the Tropic of Cancer on Earth was formed, and it was discovered that the sunlight was also fixed and took 8 minutes to travel to Earth.

Every revolution of the moon is to rotate around the earth a whole circle, this degree is 360 degrees, although the earth people are also rotating, but they can't feel it at all, because the direction of rotation and the direction of the moon's rotation are somewhat different, in the objective view of the moon is to catch up with the earth and run, if you reach a certain apex, you need to rotate again. In addition to the existence of such a mysterious phenomenon between the moon and the earth, and the emergence of such a situation between the sun and the earth, it is necessary for certain conditions to finally complete these movements.

At that time, it was around our earth, and a cycle took about 22 hours, and a year was about 329 days, which was similar to the rotation of our earth.

revolve around the Earth. The cycle is 27 days, 7 hours, 43 minutes and 11 seconds. The turn of the year is 365 days.

The moon revolves around the earth. The time for a rotation cycle is 24 hours. A year is 12 months.

In layman's terms, it's a month. Strictly speaking, it's hours. The cycle of the Moon to make one revolution (revolution) around the Earth and one revolution (rotation) on its own (rotation) is about 27 days. This alignment of the rotation period with the revolution period is due to tidal locking, which is common in the solar system.

We know that the Moon is the only satellite of the Earth, and the Moon revolves around the Earth, which is the Revolution of the Moon, and at the same time, the Earth is also revolving around the Sun, of course, the Moon is also rotating, so how long is the Moon's revolution and rotation period?

It takes one month for the Moon to revolve around the Earth, but there are two types of this month, the sidereal month and the synodic month. The time it takes for the Moon to make one revolution around the Earth is the true orbital period of the Moon, that is, a sidereal month, and the time is the sky. In fact, when we look at the moon from the earth, it completes a synodic cycle for a month, and the time is the day, why is there a difference, because the moon revolves around the earth at the same time, the earth also revolves around the sun.

The rotation period of the moon is actually the same as the rotation period, which is the sky, which leads to the other side of the moon always facing the earth, and we humans can only see this side of the moon forever, and the other side can never be seen, in fact, this situation is common in space, which is the phenomenon of tidal locking.

Put simply, a tidally locked object takes the same amount of time to make one revolution around its companion once on its axis, and this synchronous rotation results in a hemisphere facing its partner in a fixed direction. The period of the moon's revolution around the earth is days, and the moon is also rotating while revolving around the earth, and the rotation period is also days, which happens to be a sidereal month, this phenomenon is called "synchronous rotation". Since the rotation period of the Moon is equal to the rotation period, we can only see one side of the Moon on Earth, or the front side, and the other side of the Moon will never be seen on Earth.

It takes a month, the distance between them is still relatively long, and it is operated in an elliptical way.

It takes a month because we can see from Earth that the Moon changes a lot in a month.

It takes 27 days, 7 hours, 43 minutes and 11 seconds for the moon to complete one revolution.

I think it takes about a month for the moon to revolve around one week, so I think it's a long time.

1. Basic Information.

The Moon is the only natural satellite of the Earth, probably formed about 4.5 billion years ago, and shortly after the formation of the Earth, there are several hypotheses about its origin, and the theory supported by more factual evidence is that it formed from the debris of a huge collision between the Earth and the Mars-sized celestial body "Theia", which gathered in the outer periphery of the Earth.

2. Cycle time.

The motion of the Moon, like other celestial bodies, is in eternal motion. In addition to rising in the east and setting in the west, the Moon also moves from west to east on average by more than 13° per day relative to the star, so the Moon rises about 50 minutes later every day than the day before. The rising and setting of the moon in the east and setting in the west is a reflection of the rotation of the earth; The west-to-east movement is the result of the moon's orbit around the earth.

The moon's orbit around the Earth is called a "sidereal month" and has an average of 27 days, 7 hours, 43 minutes and 11 seconds. As the moon revolves around the earth, it rotates itself. <>

3. Structural composition.

The moon can be divided into three circles: the core, the mantle and the crust. The lunar crust is made up of two basic units, the highland lunar crust composed of plagioclase and the lunar sea lunar crust composed of basalt. The thickness of the lunar crust varies from region to region, but in general, the thickness of the frontal lunar crust is about 50 km on average and the thickness of the outer lunar crust is about 74 km on average.

Underneath the lunar crust is the lunar mantle, which is the main constituent unit of the Moon. The mantle is divided into the upper mantle, the lower mantle, and the attenuation band. The central region of the moon about 1,000 kilometers below the surface of the moon is called the lunar core, which is about 700 kilometers thick and can reach a temperature of 800 kilometers.

Moonquake data show that the Moon cannot have a high-density iron-nickel metal core like the Earth, but may be composed of hot, plastic, partially molten silicic acid and iron, nickel, and sulfur, which is equivalent to the Earth's asthenosphere.

The moon revolves around the earth. Almost 27 days or so, the distance between the Moon and the Earth is very close.

The moon revolves around the earth in an elliptical trajectory, and the rotation period is about days, that is, the average rotation period of the moon is days.

The moon revolves around the earth, and the time of each cycle is one month, so the full moon will be formed on the earth.

The Moon rotates while revolving around the Earth, and the period day is exactly one sidereal month. The cycle of one revolution of the earth is called a solar year, which is about 365 days and 5 hours, 48 minutes and 46 seconds. The rotation period of the Earth is 1 day, which is 24 hours.

"Moon"How to go around"Earth"Revolutionary

The Moon orbits the Earth in an elliptical orbit. The great circle of this orbital plane on the celestial sphere is called the "white path". The plane of the white channel does not coincide with the celestial equator, nor is it parallel to the ecliptic plane, and the spatial position does not change from the side of the ecliptic.

Cycle day. The average inclination of the lunar orbit (white path) to the Earth's orbit (ecliptic) is 5°09. But it is known that the Moon is gradually departing from the Earth at an average rate every year.

Anyone who has studied geography in middle school knows that we can only see the back side of the moon on Earth, but not the front of it. It's like you can only see the ecstasy back of a beautiful woman, but you can't see its true face.

Looking back, I can't help but wonder, why is there only one side of the moon visible from Earth? Secondary school geography tells us that it is because the angular velocity of the moon around the earth is almost the same as the angular velocity of the moon. So why is that?

Why is the angular velocity of the moon's rotation so similar?

When any object rotates, there is a centrifugal force, and the megalowatt causes the slightly pointed end to be on the inside, and a slightly rounder end on the outside, like the egg below. For the side of the Moon, the side close to our Earth is the pointed head, and the side away from the Earth is the round head.

The gravitational pull of the Earth makes the side of the Moon towards the Earth always sharpen a little. And always from a relatively pointed side towards the earth, the result is that we can only see the sharper side, which is the way it is now.

This phenomenon, in technical terms, is called tidal locking, which is tidal locking in Chinese. Here's an animation that explains this effect well:

More interestingly, tidal locking is a common phenomenon between planets and moons that abounds in the solar system. These include all 2 moons of Mars, 8 moons of Jupiter, and 15 moons of Saturn.

What's even more exaggerated is that Mercury, as a planet, is also tidally locked by our sun. For an observer on Mercury, one day is equivalent to two years, which means that Mercury has made two revolutions around the Sun in one revolution. But fortunately, this lock is not quite the same as the moon, otherwise there must be one side that will be scorched.