There is no moon at night, no light pollution, but there are many stars, can you light up the ground

The Full Moon is of magnitude -14, and Venus is at its brightest magnitude -4. The difference in radiation flow per fifth magnitude is 100 times, that is, Venus is 10,000 times fainter than the Moon. I don't think so, your shadow is probably caused by the atmospheric scattering itself with a certain celestial background.

Light at night can create a "double whammy" that not only disrupts sleep, but can also induce illness.

OK. According to records, in places where there is no light, Venus can shadow people and buildings when it is at its brightest.

Because they are very small, they are not easy to illuminate.

Without the help of external objects, the light of the stars is not enough to illuminate the ground.

Theoretically, yes, but it's very difficult.

It also depends on the number of stars.

Yes, but the brightness is far from enough.

Venus, at its brightest, can cast shadows on people and buildings.

The rotation period of the moon around the earth is 1 month, in this month, if the moon turns to the side facing the sun, it means that the moon only rises during the day, it is difficult for us to see, but the moon turns to the side facing away from the sun, we can see the moon rise at night, as the moon revolves around the earth, the moon rises at a different time every day, day by day, so there will be times when the moon cannot be seen at night, the day of Qixi Festival is the seventh day of the lunar calendar, it is the first quarter moon, The moon can still be seen in the western sky shortly after sunset, but the moon sets in the second half of the night, so it is not visible, and if you look at it in the first half of the night and don't see it, there are several possibilities, 1: The moon is already very low, and it is about to set, and you don't notice that direction. 2. The weather was bad that day and you didn't notice.

The reason why you can only see the moon at night and no stars is that although the moon is very bright, it will have a weakening effect on the surrounding stars, but even in a big city, on a clear night, no matter how bright the moon is, you can still see a few stars, so the reason may be that the weather is bad that night, although it may be sunny, but if the air pollution is more serious or there is some fog, the stars will not be visible, only the bright moon.

The light of the moon, in turn, can basically withstand the brightness of many stars. Therefore, the moon star is scarce. That doesn't mean there isn't. During the Mid-Autumn Festival, I saw stars as well. It can only be said that the brightness of the moon is high.

Just like usual, we don't see many stars in big cities anymore. It's not an air problem. The main reason is that our cities are too bright. I can't see many stars anymore.

Why are there not as many stars as there are in rural skies over cities, and why isn't the moon so bright? The population density in urban areas is higher than that in rural areas. The night in the city is brilliant, the light and pollution are more serious, the dust, fog and gas gathered over the city are full of stars, the city high-rises, forests, the prospect is not enough, if you want to see the stars, how to see the stars?

Shanghai, in fact, from the numerical analysis, the suburbs of Qingpu and other places, are not always better than the "air" center, sometimes the suburbs are even more hazy than the city center. In relatively static areas, air pollution levels are the same in urban and suburban areas, and even change quickly. As long as there is an air current, a strong wind (such as a cold wave), the air there is not much difference.

<> in terms of the nature of things, there are many stars in the city and in the countryside, but there are indeed many stars that can be seen in the countryside, especially on summer nights. However, back in the city, many of the little stars disappeared, and only a few hung in the night sky. The light in the city brightened, the light swayed low in the sky, and our eyes could not penetrate the mist.

This phenomenon, as one city calls it "city light", and those who hate it call it "light pollution". A photographer in the city will photograph the light, the moon, but not the beauty of the stars. In order to photograph the starry sky, or to get a village where there is a lamp, move the light to the light of the stars.

Everyone knows that the stars in the sky are the same, only the sky above the city cannot be seen, and the villages above can see bigger, brighter of course, only Minzao has the sky, what you see in the city, I am in the country, that place, this is different.

There are not many stars in the city, but they are not bright, this is due to the various buildings in the city, there is air, and most of the cities are very flat parts, and the city road is a very common road. There are big buildings in the city that obstruct the view, while the villages are more spacious and have the air quality of the city! Air pollution in rural areas is not as serious as in urban areas, and atmospheric concentrations affect the brightness of stars.

Air pollution! Cloud! There is gas in the back of the car!

Too much! There is less pollution in rural areas, the rural population sleeps relatively early, and there are fewer lights, and in cities, light has a greater impact on visual ceramics.

The urban population is well-populated and the rural environment is good.

Who told you about ......

We can see the moon entirely because the moon reflects the sun's light, in other words, we can't see the moon without sunlight. If you want to know when you can see the moon, it is best to understand the "moon phase", which is the name in astronomy for the part of the moon that is illuminated by the sun as seen on the earth, which is also known as "the moon is cloudy and sunny".

There are four types of moon phases, the new moon, the first quarter moon, the moon looking at the moon, and the second quarter moon.

New moon, the first day of the lunar month, the moon runs between the sun and the earth, and the sun haunts at the same time, and the moon can not be seen on the earth, this moon phase is called the new moon, which is why you are confused.

On the first quarter of the month, the seventh or eighth day of the lunar month, when the line between the sun and the earth and the line between the earth and the moon is at right angles, the moon seen on the earth is D-shaped, and this moon phase is called the first quarter.

Looking at the moon, on the fifteenth day of the lunar month, the earth moves between the moon and the sun. On this day, when the sun was setting in the west, the moon was rising from the east, and the earth saw a round moon.

On the 22nd or 23rd day of the lunar month, when the line between the sun and the earth and the line between the earth and the moon is at right angles, the moon is seen on the earth in a D-shape, but the "D-shaped" at this time is exactly the opposite of the "D-shaped" when it is winded, so the moon phase at this time is called the second quarter.

The moon orbits the earth every 29 days, 12 hours, 44 minutes and 3 seconds, and the time you observe the starry sky is already the end of the lunar month, and the moon at this time either shows a crescent moon or is invisible, so it is normal not to see the moon.

Make sure the weather is fine first, as if it's cloudy, you won't be able to see any celestial objects because they're all above the troposphere.

Sometimes the moon can be seen and things can't be seen because of the moon phases, which will be introduced in more detail in high school geography textbooks. In conclusion, the moon does not necessarily appear in the night sky at night.

Even in cities with severe light pollution, as long as the naked eye adapts to the darkness, you can still see the stars. As one of the most prosperous cities in the country, you can see Lepus (etc.) even on the Bund Riverside Trail, and there is no place in the country that is more prosperous than the Bund, right?

Before I was in high school, I had the same perception as the people upstairs, but when I first looked up at the night sky in the garden of the community in my freshman year and found that I could find more than 100 stars in the sky, my interest in astronomy was out of control. It is in this bustling city that I have watched meteor showers and met people who I will never forget in my life.

The pollution is too bad, go to the countryside, go to the mountains, and you will find super beautiful at night.

There are no stars in the city, and you can see them when you go out of the suburbs.

Sometimes it's not, it's not visible.

Air pollution! There is haze! Or maybe it's a cloudy day!

The rotation period of the moon around the earth is 1 month, in this month, if the moon turns to the side facing the sun, it means that the moon only rises during the day, it is difficult for us to see, but the moon turns to the side facing away from the sun, we can see the moon rise at night, as the moon revolves around the earth, the moon rises at a different time every day, day by day, so there will be a time when the moon cannot be seen at night, the day of Qixi is the seventh day of the lunar calendar, it is the first quarter moon, The moon can still be seen in the western sky shortly after sunset, but the moon sets in the second half of the night, so it is not visible, and if you look at it in the first half of the night and don't see it, there are several possibilities, 1: The moon is already very low, and it is about to set, and you don't notice that direction. 2. The weather was bad that day and you didn't notice.

The reason why you can only see the moon at night and no stars is that although the moon is very bright, it will have a weakening effect on the surrounding stars, but even in a big city, on a clear night, no matter how bright the moon is, you can still see a few stars, so the reason may be that the weather is bad that night, although it may be sunny, but if the air pollution is more serious or there is some fog, the stars will not be visible, only the bright moon.