Why is the moon in the sky round and missing?

Because light travels in a straight line.

The moon itself does not emit light, and the moon we see is the diffuse reflection effect that occurs after the sun's light hits the moon's surface. If the sun's rays can't reach the entire surface of the moon, then we can't see the entire moon, which is a lack of moon.

In the solar system, the Earth moves in a circular motion around the Sun, and the Moon moves in a circular motion around the Earth. At a certain moment, the sun, moon and earth are in the same straight line, and the earth is in the middle, blocking the sun's rays from reaching the surface of the moon, which shows that the moon is missing.

This moment is related to the radius of the circular motion of the earth and the moon, which the ancients calculated based on observations that it was about one month.

The relative positions of the Earth, Moon and Sun change.

The full moon lasts for a while, and the moon in the sky is always long. In life, not only the moon in the sky is often missing, but most people's lives always have one kind of regret or another. Lu Xun once said that Chinese often pursue a kind of "circle" and fantasize that life is perfect.

In fact, how has life ever been "round"? Natural and man-made disasters, accidents, lack of fame, career failure, family conflicts, poor health, love and hatred, life and death, all of which may be encountered. Life is a hurdle that you have to face.

Wang Yangming believes that the moon in the sky is cloudy and sunny, and there is no fixed number. It was cloudy and sunny on August 15 last year, and this year's Mid-Autumn Festival was directly cloudy to the end. How many bright full moons can a person meet in his life? Not a few times, I'm afraid.

Moreover, the full moon and the lack of the moon are all illusions of seeing, but the real moon has never been full and missing. Just like the conscience in our hearts, all of us have the same conscience, but the conscience of most people is clouded by selfish desires, greed, fame, jealousy, and delusions, like a covered moon.

The sun does not go down and the moon comes out sooner or later is not fixed, and it has a lot to do with the position of the sun, the earth and the moon in various periods, and the rotation of the earth is not uniform, and the revolution is not uniform.

Let's take a closer look at the moon's waxing and waning.

The Sun and Moon are the most familiar stars, so why is it that the Sun does not have a round and the Moon does?

That's because the light emitted by the sun is ** to itself, that is, it can shine by itself, and the moon relies on the light reflected by the sun to the moon. If you observe a lunar eclipse, you will have the common sense that you can't see any light from a total lunar eclipse, and that's because the moon is just in the shadow range of the earth at that time. A partial lunar eclipse, on the other hand, is when a portion of the moon enters the Earth's shadow.

This is a strong proof of the moonlight produced by the sun's rays hitting the moon.

According to the algorithm of the lunar calendar, the moon orbits the earth once is the lunar month, that is, the cycle of the moon's change. On the first day of the new year, half of the moon hit by the sun's rays is facing away from the earth, and we can't see it. Half of the moon, the half of the moon that is illuminated by the sun is exactly facing the earth, so we see the full moon.

However, it slowly reverts back to a small size until it is no longer visible. It is in this way that the moon changes over and over again. And we will see the change in the waxing and waning of the moon.

Question 1: Why does the moon wax and wane? First of all, the waxing and waning of the moon that we see is called the change of the phases of the moon, also known as the waxing and waning.

Second, why is this happening? Because on the first day of the lunar calendar, the moon orbits exactly halfway between the earth and the sun, and the dark side of the moon is facing the earth, so the moon is not visible from the earth, and it is called the new moon or crescent moon; On the seventh (or eighth) day of the first month, you can see half of the moon, which is dark in the east and bright in the west, which is called the first quarter moon; On the fifteenth (or sixteenth), the moon moves to the far side of the earth, so that the round moon can be seen hanging high in the sky, which is called a full moon or wang; Around the 22nd, the western half of the moon is dark and the eastern half is bright, which is called the last quarter moon. The moon is a lunar month with a cycle from the first quarter of the new moon to the first quarter of the moon, the full moon and the second quarter of the moon.

Therefore, the change in the circle of the moon is determined by the position between the sun, the earth, and the moon. The main reason for the change in the mutual position of these three is that the moon revolves around the earth (the period is about days), and because the earth revolves around the sun (this is a secondary reason), the period of the moon phase change is greater than the sky, about days.

Look at the diagram, get it?

Question 2: Why does the moon have a change in the circle The light on the moon is the reflected light of the sun, because the position of the moon is constantly changing when it revolves around the earth, so the phenomenon of the earth covering the sun's rays will occur, and from the ground, it will be cloudy and sunny within a month.

Question 3: Why does the moon wax and wane? First of all, the waxing and waning of the moon that we see is called the change of the phases of the moon, also known as the waxing and waning.

Second, why is this happening? Because on the first day of the lunar calendar, the moon orbits exactly halfway between the earth and the sun, and the dark side of the moon is facing the earth, so the moon is not visible from the earth, and it is called the new moon or crescent moon; On the seventh (or eighth) day of the first month, you can see half of the moon, which is dark in the east and bright in the west, which is called the first quarter moon; On the fifteenth (or sixteenth), the moon moves to the far side of the earth, so that the round moon can be seen hanging high in the sky, which is called a full moon or wang; Around the 22nd, the western half of the moon is dark and the eastern half is bright, which is called the last quarter moon. The moon is a lunar month with a cycle from the first quarter of the new moon to the first quarter of the moon, the full moon and the second quarter of the moon.

Therefore, the change in the circle of the moon is determined by the position between the sun, the earth, and the moon. The main reason for the change in the mutual position of these three is that the moon revolves around the earth (the period is about days), and because the earth revolves around the sun (this is a secondary reason), the period of the moon phase change is greater than the sky, about days.

Look at the diagram, get it?

Question 4: Why does the moon have a change in the circle The light on the moon is the reflected light of the sun, because the position of the moon is constantly changing when it revolves around the earth, so the phenomenon of the earth covering the sun's rays will occur, and from the ground, it will be cloudy and sunny in a month.

Question 5: Why does the moon have a round gap because the orbits of the sun, the earth, and the moon are different.

It's because of the revolution of the moon. The moon itself does not emit light, its light is reflected to our earth after being irradiated by the sun. The main reason for this phenomenon is the reflection of sunlight by the moon as it revolves around the earth.

Hello dear because on the first day of the lunar calendar, the moon is exactly in the middle of the earth and the sun, and the dark side of the moon is facing the earth, so the moon is not visible on the earth, and it is called the new moon or crescent moon at this time; At the beginning.

7. At the eighth hour of the first month, you can see that the moon is dark in the east and bright in the west, which is called the first quarter moon; From fifteen to seventeen, the moon moves to the far side of the earth, so that the round moon can be seen hanging high in the sky, which is called the full moon or wang; Around the 23rd, the western half of the moon was dark and the eastern half was brightThe moon is cycled from the first quarter of the new moon, the full moon to the second quarter of the moon, and the time between this is exactly one month, so the change of the moon's circle and absence, it can be said that the position between the sun, the earth, and the moon is determined. In layman's terms:

When the moon is missing, it is because it is blocked, and when it is full, it is not blocked.

The moon is sometimes round and sometimes absent because of its revolution.

The moon itself does not emit light, its light comes from the sun's irradiation, and then reflects back to our earth. The main reason for this phenomenon is that the moon is reflected by the sun's rays as it revolves around the earth, so the moon we see is sometimes round and sometimes absent.

The moon revolves around the earth all the time, and the sun's rays shine on the moon, illuminating at most half a moon, and this illuminated drastic change resistance to half a moon surface can not be observed by all humans on the earth every time, with the rotation of the moon, the area of the moon that can be seen is changing at all times.

The part of the moon that is illuminated by the sun is bright, and the part that is not illuminated is dark. Although the Moon is half a sphere at a time, because the position of the Sun, the Earth, and the Moon changes from day to day, sometimes the Moon faces the Earth on the perfectly bright side, and sometimes on the side towards the Earth. In this way, the moon shows a change in cloudiness and sunshine.

The relationship between the Earth and the Moon

The Earth and the Moon orbit each other, and the two celestial bodies rotate around a common center of gravity 1,600 kilometers below the surface. The birth of the moon has added a lot of new things to the earth. As the Moon revolves around the Earth, its special gravitational pull attracts the water on Earth and moves with it to form a tidal wave.

Tides helped the earth's early aquatic life to move to land.

A long, long time ago, the earth had a large temperature difference between day and night, and the temperature was between the boiling point and the freezing point of water, which was unsuitable for human habitation. However, the special influence of the moon and the gravitational pull of the earth's seawater have slowed down the earth's rotation, making the earth's rotation and revolution period tend to be reasonable, bringing us precious four seasons and reducing the temperature difference, so as to be suitable for human habitation.

The above content reference: Encyclopedia - Moon.