It s 9 o clock and the sky is still bright.

If the sky is still bright at 9 p.m., it could be due to a number of reasons.

The first may be the daylight phenomenon. In some seasons or geographical locations, the sky still has a bright light for a period of time after the sun sets at night, which is known as the daylight phenomenon. This phenomenon is more common in areas close to the Arctic or Antarctic, as these areas have relatively long daylight hours.

In addition, in high-altitude cities like Xining, the brightness of the sky at night may also be noticeable due to the thin air.

In addition to daylight phenomena, celestial phenomena are also one of the possible causes. For example, in some seasons or under special celestial conditions, such as around the summer solstice, when the sun shines directly on the Tropic of Capricorn, the polar day phenomenon occurs in the Arctic Circle, causing the sky to remain bright until after 9 p.m. This phenomenon is especially pronounced in the summer, when the hours of sunshine are relatively long.

In addition, under certain special geographical locations or celestial operating conditions, it is also possible that the brightness of the sky will continue beyond 9 p.m. For example, when near certain reflective nebulae or star systems outside the solar system, sky brightness may persist for a longer period of time due to the reflection of the nebula or star.

It is important to note that although the sky is still bright at 9 p.m., it does not necessarily mean that it is caused by daylight phenomena or special celestial phenomena. Sometimes it can just be because the sun hasn't completely set, or because of factors such as the lights of the city. Therefore, when judging the cause, it is necessary to consider many factors comprehensively.

If it's 9 a.m., the sky is usually bright. If it's nighttime, it's likely to be daytime or other celestial phenomena. It's possible on other planets. Hehe.

This has to take into account various factors such as time zone, terrain, etc. For example, China spans three time zones, but only uses Beijing time, which is prone to this situation.

There are two concepts of a bright sky at night, one is that the background of the sky is brighter, but there are fewer or no stars; The second is that the background of the sky is dark, but there are many stars and they are bright. According to what you said, it should be the first case.

This situation is usually formed by the reflection of the ground light from the sky, that is, the sky is illuminated by the ground light.

There could be several reasons for this.

Cloudy. There is a lot of cloud cover at low altitude. Ground lights are reflected from the ground and enter the sky, and then diffusely reflected by the bottom of the clouds.

The sky looks brighter.

Air humidity. Large, misty. When the temperature drops at night, the moisture in the air partially condenses into fog, diffusing the light from the ground and brightening the sky.

Air quality. Poor, hazy. Haze particles, like fog droplets, can also diffuse reflection of light on the ground.

There is sand and dust in the air at low altitudes. During a floating dust or sandstorm, the night sky is illuminated by the reflected light of the sand and dust floating in the air.

Summary. The sky after 99 o'clock is generally pitch black, only the stars are dotted, the moon may also appear, the sunset may also appear, and the night sky is more beautiful and more romantic.

The sky after 99 o'clock is generally pitch black, only the stars are dotted, the moon may also appear, and the evening first Tongxia may also appear, and the night sky is more beautiful and more romantic.

You've done a great job! Can you elaborate on that?

The sky is generally darker after 99 o'clock because the sun has already set, and the intensity of the sunlight will be weakened. At this time, the color of the sky will also become darker, and sometimes even a deep blue sky will appear in the spike clusters. Workaround:

1.Try to avoid going out after 99 o'clock to avoid being exposed to the sun, thus reducing damage to your eyes. 2.

If you have to go out after 99 o'clock, you can wear sunglasses to reduce the exposure of sunlight and protect your eyes. 3.Try to avoid going out at night to avoid being affected by the dark skies of the night.

Personal Tips:1Try to avoid going out at night to avoid being affected by the dark skies of the night.

2.Try to avoid going out after 99 o'clock to avoid being exposed to the sun, thus reducing damage to your eyes. 3.

If you have to go out after 99 o'clock, you can wear sunglasses to reduce the exposure to the sun and protect your eyes. Related knowledge: The sky at night is generally darker than during the day, because the sun has set, and the intensity of the sun will also be weaker.

At this time, the color of the sky will also become darker, and sometimes even a dark blue sky will appear.