When the Moon is full when you look at it from the Earth, what is the shape of the Earth when you se

I asked the landlord to do an experiment, take a soccer ball, and put a half side on the picture a color. Why? Because the Moon has a special law that the rotation period and the revolution period are equal, the Moon is always facing the Earth when observed on Earth.

There should be a TV at home, please stand in front of the TV now, holding a football, then half of the football should be illuminated by the light of the TV, right? Now take the soccer ball around and keep the colored side always facing you (the colored side is the half of the Moon that the Earth can observe).

Did you find any phenomena? When the TV, the football, and the observer are connected in a line, the colored side cannot find the light of the TV; When the TV, the observer, and the soccer are all in one line, the colored side of the soccer is completely illuminated; When the TV-Spotter-Football is at a 90° angle, only half of the colored side is illuminated.

In the universe, television is the sun, football is the moon, and the observer is the earth. The cyclical change of the phases of the moon is due to the periodic change in position between the three.

Now I believe that the landlord should have a certain understanding of this problem, and there will be periodic changes when looking at the earth from the moon. And looking at the moon on the earth and the moon looking at the earth is the opposite, for example, if you see a new moon on the earth, then you can see the ground on the moon, which is why please ask the landlord to think about it himself.

After the 50s of the 20th century, science and technology developed very rapidly, opening up a variety of ways for geodesy, high-precision microwave ranging, laser ranging, especially artificial satellites in the sky, coupled with the use of computers and international cooperation, so that people can accurately measure the size and shape of the earth. Through measurement and analysis, the exact data were finally obtained: the average equatorial radius of the earth is kilometers, the polar radius is kilometers, and the circumference of the equator and the circumference of the meridian direction are 40,075 kilometers and 39,941 kilometers, respectively.

The measurements also found that the Arctic region was about a metre higher and the Antarctic region was 24.30 metres lower. The shape of the earth, it seems, is like a pear: its equatorial part bulges, which is its "pear body"; The North Pole is a bit pointed, like a "pear"; The South Pole is a bit concave, like a "pear navel", and the whole earth is like a pear-shaped rotating body, so people call it "pear-shaped earth".

To be precise, the Earth is a triaxial ellipsoid.

It is dark, because the moon reflects the sun's light at the full moon, and the earth should be in a shadow when viewed from the moon's side facing the earth.

No, elliptical, the reason is not clear.

When the Full Moon is seen on Earth, what is seen on the Moon is the "New Earth". When the Moon is full, the Moon is roughly on the extension line between the Sun and the Earth. The half-moon seen by the Earth is about the same as the half-moon illuminated by the Sun.

But at this time, when we observe the Earth on the Moon, we observe that the hemisphere is not illuminated by the Sun, which is similar to the state of seeing a new moon on Earth. The ultra-wide angle used by Apollo when photographing the Earth naturally produces visual distortion.

The average person's eye is almost at a focal length of 45-55 mm, which is why a 50 mm portrait lens is closest to the human eye. How can you tell if the Earth that an astronaut sees on the Moon looks smaller than the Moon you see on Earth? Second, there is a certain amplification effect in the atmosphere, because it creates reflection and refraction effects as the air gets thinner and thinner from the ground.

For example, the sun appears to be greater in the morning than at noon. Note, however, that the mass of the Earth is much greater than that of the Moon.

According to Newton's second law and the law of uniform circular motion (approximate), this force is not enough to complete the centripetal motion of the Earth towards the Moon. This force will cause a tidal wave in the Qiantang River. Even if the massive planet revolves around the massive planet at this time, assuming that this force is large enough to act as a centripetal force around the massive planet, but this force is too great for the massive star, it will move closer to the massive star (be adsorbed), and this state is unstable.

The final state is likely to become smaller and smaller, and if the structure and composition are similar, the early environments of the two planets will be very similar. Considering that microbial spores can remain active in the space environment for decades, microorganisms floating and attached to the rarefied atmosphere have been found on the outer walls of the International Space Station. Microorganisms may continue to circulate between the Earth and the Moon.

However, it is difficult for multicellular organisms to cross the gravitational barrier, so it is likely that one (such as Earth) organism has landed on land, given birth to humans and entered the space age, while the other planet is still only primitive organisms.

It's very spectacular, you can see a three-dimensional version of the map, you can see mountains, rivers, lakes, oceans, you can see a lot of glaciers, you can also see a lot of students, it's like seeing a map. It must not be the same size, after all, the volume of the moon and the earth is not the same.

When viewed from the Moon, the Earth will look different depending on the time and changes, and the Earth will appear pale blue or transparent, and it will not be able to show the whole picture. It's not the same as standing on the moon and looking at the earth, but you can also feel that the volume of the earth is relatively large.

It's particularly beautiful; It's different, because looking at the Earth from the Moon is much larger than looking at the Moon from the Earth, and of course it has something to do with the distance between the two and the size of itself.

The Moon is a satellite of the Earth, and the Moon revolves around the Earth.

Here's what the Earth pair looks like when viewed on the Moon:

How big is the Earth from the Moon? The diameter of the Earth is 12,756 kilometers, while the diameter of the Moon is 3,476 kilometers. The diameter of the Earth is about twice that of the Moon. Therefore, the apparent diameter of the Earth as seen from the Moon is twice as large as the Moon as we see it from Earth.

It would feel strange to see the Earth from the moon. Living on Earth, we are accustomed to the moon in the sky. If you look back at the earth from the moon, the earth has become the moon hanging in the sky.

This will make you very confused, who is in the sky between the earth and the moon, which just confirms that there is no absolute upper and lower in the universe.

The Moon is detailed below:

Some people feel that looking at the Earth from the moon will give them an inexplicable sense of fear. Why? Although the moon is only 10,000 kilometers from the earth.

It is the closest celestial body to Earth. But the Moon and the Earth are two very different worlds. The Earth is a vibrant world.

The moon, on the other hand, is a lifeless, desolate world.

Our flower grower, Chang'e-4, once planted a piece of cotton on the moon. With the help of the warm and suitable environment in the detector laboratory, the cotton grew two leaves. But when the half-moon-long night on the moon fell, the temperature in the greenhouse plummeted, and the cotton, which brought the first touch of green to the moon, froze to death.