Why is the sun always round, but not the moon?

First of all, you have a misunderstanding here. Usually, when you see that the moon is not round, it is not due to the fact that it is occluded by the earth. It's the relationship between the angle of the sun's illumination.

It's like taking a photo with side light, even if there is nothing to block the sun, only half of your face is bright, right? This is the reason why the moon is full and waning. Only when it is rare to have a lunar eclipse is the sun blocked by the earth.

But this will soon be reunited. Just understand that. I know why the moon is not round when I see it during the day.

Because it is impossible for the sun to face the moon at this time? Far from being round. And it is impossible to exceed a semicircle.

Because the sun is much farther from the earth than the moon. So from the Earth, the sunlight is shining from behind the side of the moon. So it can only shine up to the small half moon.

It should be that the earth takes the light of the sun like the moon, so we don't look like the moon is round. The sun is not always round, for example, when there is a solar eclipse, the sun does not look round.

Because"People have joys and sorrows", so"The moon is cloudy and sunny".

The sun is not always round, so the earth should take the light of the sun like the moon, such as when there is a solar eclipse, so we don't look like the moon is round.

Remember a scene under the moon? Imitate it.

Answer: The round moon emits a soft moonlight. A few thin gray clouds lingered in the soft moonlight, and the river, which had been running for a day, subsided.

The moon is reflected on the surface of the river, and when the evening breeze blows, it sparkles like a piece of white jade, like a ribbon adorned with precious stones. With a kind and gentle smile on my mother's round face, she quietly watched me play in the moonlight. <>

Xu Ruzi admires the moon.

Original text] Xu Ruzi was nine years old, tasted the moon play, and said: "If there is nothing in the moon, it should be extremely evil?" Xu said: "No." For example, if a person has a pupil in his eye, without it, he will not know. ”

When Xu Ruzi was nine years old, he used to play in the moonlight, and someone said to him: "If there is nothing in the moon, it will be very bright, right?" Xu Ruzi said: "It's not like this, it's like a human eye has a pupil, without it, the eye is not bright." ”

The subtlety: the human eye is compared to the moon, and the questioner is asked with the help of something.

It is rare that a nine-year-old naughty boy can be so full of questions.

The moon we see every day, its brightness, darkness, and position are different, this phenomenon is called.

The change in the phases of the moon is also known as profit and loss. Why is this phenomenon auspicious? Because on the first day of the lunar calendar.

The moon feast ball runs right in the middle of the earth and the sun, and the dark side of the moon is facing the earth, therefore.

The Moon is not visible on Earth, and it is called the New Moon or New Moon; At the beginning.

Seventh, the eighth day of the first month, Lu Mingke.

to see that the moon is dark in the east and bright in the west, which is called the first quarter moon; Fifteen to seventeen, the moon.

It 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 hope; Around the 23rd, the western half of the moon was dark and the eastern half was bright, which was called at this time.

For the second quarter of the month

The moon cycles from the first quarter of the New Moon, the full moon to the second quarter, and the time between this is exactly the time.

One month, therefore, the change of the moon's circle and absence, can be said to be caused by the sun, the earth, and the moon.

between the location to decide.

In layman's terms: when the moon is missing, it is because it is blocked, and when it is full, it is not blocked.

Because the Moon revolves around the Earth, the Earth's position changes every day as it revolves around the Sun. The moon does not emit light, and the moonlight we see is the light it reflects from the sun.

The moon, known as Taiyin in ancient times, is a satellite that orbits the Earth. It is a solid-state satellite of the Earth and the closest celestial body to the Earth (the average distance from the Earth is 390,000 km). In 1969, Neil Armstrong and Buzz Aldrin became the first humans to land on the moon.

In September 1969, the U.S. Apollo 11 spacecraft returned to Earth, and the U.S. Apollo moon landing program ended with Apollo 17.

The Moon is the most thoroughly studied celestial body. The second celestial body that humans have ever visited is the Moon. The age of the Moon is about 4.6 billion years.

The Moon, like the Earth, has a layered structure such as a shell, mantle, and core. The average thickness of the outermost lunar crust is about 60-65 km.

Below the lunar crust to a depth of 1,000 km is the lunar mantle, which occupies most of the moon's volume. Underneath the mantle is the lunar core, which is about 1000 degrees warm and most likely molten. The diameter of the Moon is about one kilometer, about 1 4 times the size of the Earth and 1 400 times that of the Sun.

The distance from the Moon to the Earth is equivalent to 1,400 of the distance from the Earth to the Sun, so the Moon is as large as the Sun when viewed from the Earth. The volume of the Moon is about 1 49 of the Earth, and the mass is about 735 billion tons, which is almost equivalent to about 1 81 of the mass of the Earth, and the gravity of the surface of the Moon is about 1 6 of the Earth's gravity.

The Moon is always facing us on one side, which we are used to call frontal. On the other hand, the far side of the Moon is mostly invisible from the Earth, except in the area near the edge of the Moon's surface which is visible in the middle due to the movement of the scales. In the days when there were no probes, the far side of the moon was an unknown world.

One of the great features of the far side of the Moon is that there are almost no fainter lunar features like the Lunar Sea. And when an artificial probe runs to the far side of the moon, it will not be able to communicate directly with Earth.

Because the earth revolves around the sun, and the earth rotates, and the moon revolves around the earth, these combined factors lead to the fact that the moon is cloudy and sunny.

When the sun shines on the moon and is not blocked by the earth, the moon is round, and vice versa. It's crooked.

To put it simply, the moon is not a star, it does not emit light on its own, and the part of the moon that we see is only illuminated by the sun. Due to the constant movement of the moon and the earth, the part of the moon illuminated by sunlight will not always face the earth, sometimes more, sometimes less, there will be periodic changes, and during this period we can only see the part of the moon illuminated by sunlight. As a result, the moon will continue to change periodically.

The Moon revolves around the Earth, and the Earth's position changes every day as it revolves around the Sun. The moon does not emit light, and the moonlight we see is the light it reflects from the sun. Because the position of the Earth changes daily, every day the position of the Moon, the Earth, and the Sun is not the same as each other.

Sometimes we see the moon bent because the earth is between the moon and the sun, and the earth blocks part of the sun's rays, and the sun's rays that are not blocked are directed towards the moon and reflected by the moon, and we see the incomplete moon. When the earth does not block the sun's rays, the sun's rays hit the entire moon, which is a complete, round moon.

The position relationship between the Sun, the Earth, and the Moon.