Why can you only see half a moon sometimes?

The Earth's obscuration of the Moon is a lunar eclipse, and the moon's cloudiness is caused by the sun shining at different positions on the moon.

First of all, the Moon has long been tidally locked by the Earth, which means that it will always face the Earth; Secondly, the moon revolves around the earth, about once a month (lunar calendar) (day), but it is a day relative to the sun's light, so the lunar calendar is about 30 days a month, and the moon is cloudy and sunny and full and missing once a month.

Why is the moon cloudy and sunny? It is because the earth is also revolving, and the moon revolves around the earth, and the position of the moon facing the sun is different at all times, and the position of the sun shining on the moon is different.

The time it takes for the moon to revolve around the earth is the same as the time it rotates, and once it goes around the earth, it also makes a circle, and the sun shines on it also goes around, and the moon is cloudy and sunny.

So if we live on the moon, there will be half a month of day, half a month of night.

The Moon always faces the Earth only once, while sunlight moves on the Moon, which is the origin of the changing shape of the Moon that we see.

The moon can be seen during the day because the sun rises and sets on days that are not exactly the opposite of the moon's rise and set, the sun rises and the moon has not yet set, or the sun has not yet set, but the moon rises early.

At this time, there is no difference between the moon we see during the day and at night, it is as big as it is, and it is half as it is.

The moon is seen less during the day because the light of the sun is so bright that it obscures the light of the moon, and soon after the sun rises, the moon often travels to the other hemisphere to show the people of the night.

So how do full and new moons, as well as lunar eclipses, come about? We can only see the full moon when the moon is on the other side of the line between the sun and the earth.

It is generally around the 15th day of the lunar calendar, when the moon, which is always facing the earth, is basically all facing the sun, so the sun shines on the hemisphere of the moon on our side, and we can see the full moon.

But on the day of the full moon, the moonrise and moonset coincide with the opposite of sunrise and sunset, so it is difficult to see during the day.

Because both the Earth and the Moon are spinning, only half of them can be seen.

Because the sun's rays are so strong that they obscure the moon's rays.

Because the sun's rays don't all shine on the moon.

Because of the problem of light, and the moon is relatively close to the earth.

It is mainly obscured by other atmospheric materials.

Because the other half moon will be blocked by some substance.

Because part of the sun's light is obscured by Jupiter.

Because at that time, the other half of the moon may have been obscured by the clouds.

Because the light of the moon is blocked by the earth.

Maybe it's obscured by clouds or something.

First, in terms of the mass distribution of the Moon, the Moon is not an absolute sphere, and second, the Earth's oceans have a tidal effect on the Moon (rocks, land, etc. also have tidal forces.

but weaker than the ocean).

At first, the rotation of the moon and the autobiography are not synchronized, so when the moon revolves around the earth, the tidal force has an effect on the moon, and this effect has two effects on the moon, the first is the magnification relationship between the revolution and the autobiography, that is, when the moon is relative to the earth (with the earth as a reference frame.

When the autobiographical period is an integer multiple of the revolution period, then the tidal force is a very regular change effect for the moon, then the rotation of the moon will be stabilized, and when the rotation and revolution are not multiples, the effect of the tidal force on the moon is irregular, and this irregular effect is to make the rotation of the moon tend to be a multiple of the revolution, and finally the autobiography of the moon will be stable on a multiple of his revolution period, as for how many times depends on his own rotation period, for example, the rotation is a multiple of the revolution, Then when the moon rotates.

When stabilized, he must have a 3-fold revolution period, and if it is a cycle, it will eventually be synchronized with the revolution.

Since the rotation and rotation cycles are the same, the moon we see is naturally only the same side, so we can't see the back of the moon. I just mentioned that tidal forces have two effects on the moon, and now there is a second effect that is not said, that is, the moon is moving away from the earth, which is also due to tidal forces. Then we know that considering the Earth-Moon system, the lunar principle Earth must be mechanical energy.

It has become larger (although the kinetic energy is smaller, but the gravitational potential energy.

So how does the Moon get this energy and hide away from the Earth? Then here involves the effect of tidal forces on the earth, just now only consider the two effects of tides on the moon, then for the earth-moon system the earth has no kinetic energy, gravitational potential energy has just been considered, so what else is the energy base collapse involved? That is the earth's rotational energy **kinetic energy), the moon's principle of the earth at the same time, our earth's self-transformation is slow, that is to say, a long time ago the earth's day was shorter than now, and in the long future the earth's day will be longer than now.

That's what we're doing right now.

Because the sun and the moon are brighter than the stars, the sun is the star, and the moon is the moon, and there are many in the universe, but they are far away from us; We said"It's just that Lu Jing has a sun and a moon", which is of our own solar system, is very close to us, and therefore feels less. Fundamentally, that's how the universe was done when it was big, and then over time, it slowly formed this result due to the action of force.

The moon is just a name, because there is only the moon and that planet, we call it the moon, so there is only one.

As we all know, the Moon is the only natural satellite of the Earth! The ancients affectionately called the moon Chanjuan, which means that there is only one moon that people can see when they stand on the earth. He will connect with the people who miss each other!

There are also many legends about the moon in our country! It can be said that the moon is already essential in life. But there are many moon-like planets in the universe, but we don't call them moons anymore.

There are countless stars like the moon in the vast universe, and it is only because of the geographical proximity of the moon that the people on the earth feel that there is only one moon; I believe that there will be another exciting town in other universes.

Originally, there were two, and the other one was renamed the Sun. So there's only one moon left.

These are the planets that hold the gods running! Lu Pi Xuan said in another way, such as accompanying the burning fruit is called the moon! So how to tell the difference! So each one has a unique name, so there's only one.

Because the moon represents my heart, I love you only one.

Because there are tens of billions of light-years between stars, otherwise stars without distance would have collided with each other and turned into small meteorites.

Because the moon is a satellite of the earth.

Because at the moment only one Milky Way has been discovered.

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When the moon is only half there, it is called the quarter moon.

The first quarter moon is divided into the first quarter moon and the second quarter moon, which is due to the continuous change of the position of the sun, earth and moon, and there will be a change in profit and loss after the moon phase is over. The so-called upper and lower quarter moons, judging from the phases of the moon, can still see the complete edge arc of the moon as a bowarm, making a dotted line connecting the two ends of the arc, imagining a bowstring, the string on the upper side of the moon is the first quarter of the moon, and the lower side of the moon is the lower quarter of the moon. As shown in the figure, the moon is the first quarter of the moon, which is the phase of the first half of the moon, and the second quarter of the moon is the phase of the second half of the moon.