When a lunar eclipse is seen on Earth, a person standing on the Moon on the side facing the Earth wi

c, During a lunar eclipse, the Earth is between the Moon and the Sun, so part of the Moon is blocked by the Earth. Therefore, people on the moon facing the earth will not be able to see the sun, and the entire moon will be covered during the lunar eclipse, which means that there is no light of the sun on the moon, that is, the sun cannot be seen, which is a total solar eclipse.

d Bright Earth; There is a shadow of the moon on Earth.

b.or cThe order of the 3 celestial bodies at the time of a lunar eclipse is: Sun-Earth-Moon.

Standing on the moon is to see the earth blocking the sun, due to the close distance between the earth and the moon, the earth seen on the moon is larger than the sun, and what is seen in the shadow of the earth is a total solar eclipse; What is seen beyond the Earth's shadow is a partial solar eclipse.

There are two scenarios:

In the event of a partial lunar eclipse, a total solar eclipse will be visible in the moon's shadow, while a partial solar eclipse will be seen elsewhere.

In the event of a total lunar eclipse, it will be completely obscured by the Earth's shadow on the Moon, and it will be easy to have a total solar eclipse everywhere.

Let's discuss it on a case-by-case basis

When a total lunar eclipse occurs on Earth, the Moon fully enters the Earth's umbra, and a total solar eclipse will be seen on the Moon facing the side of the Earth. But the Earth's atmosphere has a strong refraction of red light, which has the longest wavelength. Therefore, at this time, a ring of red light will be seen around the Earth's atmosphere on the Moon.

Similarly, during a total lunar eclipse, we will see a red moon on Earth. Instead of not seeing the moon.

When a partial lunar eclipse occurs on Earth, the Moon partially enters the Earth's umbra. People on the occluded Moon will see a total solar eclipse at this time, and those on the unoccluded Moon will see a partial solar eclipse.

When a penumbral lunar eclipse occurs on the earth, the moon enters the penumbra of the earth, and there is still sunlight shining on the moon at this time, but the brightness of the moon does not change much, and it is difficult for people on the earth to perceive the change in the brightness of the moon with the naked eye. At this time, a partial solar eclipse can be seen on the entire side of the Moon facing the Earth.

The radius of rotation of the Moon is less than the length of the Earth's umbra, so there will never be an annular lunar eclipse on Earth, and there will be no annular solar eclipse on the Moon.

Therefore, b and c are both correct.

When people on Earth watch a lunar eclipse, it is the Earth that blocks the light from the Sun shining on the Moon, and if an observer on the Moon is in the shadow of the Earth, what they see will be a total solar eclipse. What is seen outside the shadows may be a partial solar eclipse or no solar eclipse.

A solar eclipse, also known as a solar eclipse, is the movement of the moon between the sun and the earth, if the three are exactly in a straight line, the moon will block the light of the sun to the earth, and the black shadow behind the moon falls on the earth, and the solar eclipse phenomenon occurs.

In 2016, there were two solar eclipses in Tianyu. The timing of the two eclipses is a total solar eclipse on March 9 and an annular solar eclipse on September 1. On August 22, 2017, Beijing time, a total solar eclipse swept across the United States. On the evening of August 11, 2018, a partial solar eclipse was staged.

The main reason why a total solar eclipse is valued is that it is of great astronomical value, because the moon will dim the originally dazzling sun and reveal the coronal layer that is not easy to observe.

The formation of a lunar eclipse. In the Sun-Earth-Moon system, the Sun is (), and when (), the Moon enters the Earth's shadow.

In the Sun-Earth-Moon system, the Sun is the central star. When the Moon is exactly between the Earth and the Sun, and the distance between the Moon and the Sun is less than the distance between the Earth and the Sun, the Moon enters the shadow of the Earth and forms a lunar eclipse. This kind of shorting can only happen during the full moon, because only then will the moon be between the Earth and the sun.

When the Moon enters the Earth's shadow, it will appear red or dull because the Earth's atmospheric deficit layer will scatter sunlight onto the surface of the Moon, and the Moon will be completely in the Earth's umbra zone during the total eclipse, showing a dull color; However, in the penumbra, the Moon is only partially occluded and appears red.

A lunar eclipse is a special astronomical phenomenon that refers to the fact that when the Moon moves to the shadow part of the Earth, the area between the Moon and the Earth will be blocked by the Earth's sunlight, and a piece of the Moon will be missing. The Sun, Earth, and Moon at this time happen to be (or almost) in the same straight line. Lunar eclipses can be divided into three types: partial lunar eclipses, total lunar eclipses, and penumbral lunar eclipses.

Lunar eclipses can only occur around the fifteenth day of the lunar calendar.

During a total solar eclipse, the Moon is in the middle of the Earth's Sun, with the shade facing the Earth, because the Moon actually only appears to be as big as the Sun, but it is actually small, and the Moon shadow cannot completely cover the Earth's sunny side, so it will leave a circular shadow on the Earth's surface, which will sweep over the Earth's sunny side over time. Something like "there's a little black dot on a full moon".

Solar eclipse: It is the movement of the moon between the sun and the earth, if the three are exactly in a straight line, the moon will block the light of the sun towards the earth, and the black shadow behind the moon will fall on the earth, and the solar eclipse phenomenon will occur. Solar eclipses generally occur on the first day of the lunar calendar.

Since the orbits of the Moon and the Earth are not perfectly circular, and the distance between the Sun and the Moon and the Earth is sometimes near and far, the shadow formed by the sun's rays being obscured by the Moon can be divided into umbra, pseudoumbra (formed when the Moon is far away from the Earth) and penumbra on the Earth.

Solar and lunar eclipses are typical examples of light propagating in a straight line in the same homogeneous medium. It is not every time a solar eclipse occurs when the moon moves between the sun and the earth, and two conditions need to be met for a solar eclipse to occur.

When you look at the Earth on the Moon during a total solar eclipse, you will see a dark shadow. That's a projection of the Moon on Earth.

It's red, and the wavelength is long, so it's red.

Pick B. Light travels in a straight line in the same homogeneous medium, and solar and lunar eclipses are phenomena that occur due to the straight line propagation of light.

A solar eclipse is when we can't see the sun or can only see part of it, because the moon blocks the light from the sun shining on the earth, so we can't see or can only see part of the sun; A lunar eclipse is when we can't see the moon or only see part of it, because the earth blocks the light from the sun shining on the moon, so we can't see or only see part of the moon.

When a solar eclipse occurs, the Moon is between the Sun and the Earth, and the Earth behind the Moon cannot be directly illuminated by the Sun, and the observer in the umbra sees the Sun that is completely occluded, which is a total solar eclipse, and the observer in the penumbra can only see the partially obscured Sun, which is a partial solar eclipse.

When the moon is far away from the earth, the distance of the umbra cannot reach the earth, and a umbra projection area is generated, and the moon blocks the center of the sun, and the phenomenon at this time is called annular solar eclipse Lunar eclipse refers to the earth between the sun and the moon, and the reflection of sunlight on the moon cannot be seen from the earth, that is to say, the shadow of the earth is cast on the moon, and the partial lunar eclipse can be observed in the penumbra area, and the total lunar eclipse can be observed in the umbra total lunar eclipse and partial lunar eclipse both occur only when the moon is full, and there is no annular lunar eclipse. To sum up, only option B is correct.

What is formed is a lunar eclipse. A lunar eclipse is when the Moon moves to the shadow of the Earth, and the shadow of the Earth is visible on the Moon when the sunlight is blocked by the Earth.