Lives on the earth, the sun and the moon are the two brightest celestial bodies, and the brightness of the moon is second only to the sun. The light of the moon comes from the reflection of the sun. Although the moon usually appears at night, we occasionally see the moon during the day, and even see the scene of the sun and the moon shining together.
The moon appears during the day, and it also reflects the sun's light. However, because the moon is closer to the earth of and has a better position, the moon is brighter than the sky during the day.
Earth's atmosphere and the position of the earth's moon affect the brightness of the moon:
The brightness obtained by the moon reflecting sunlight is far less than that of the sun's brightness, but the distance between the earth and the moon is very close, so the moon is still a clearly visible celestial body. The main reason for the moon disappearing into the sky is that the earth's atmosphere scatters light, which causes the moon's light to scatter in the atmosphere, making it difficult for the moon to be observed. If the earth does not have an atmosphere, the moon will be visible celestial bodies for most of the time.
Another key factor is the position of the earth and the moon. The moon moves between the earth and the sun. If the dark side of the moon faces the earth, the visibility of the moon will be reduced.
The most important factor in the moon can appear during the day is that the moon's light needs to overcome the scattering effect of the earth's atmosphere and is greater than the brightness of the scattered light of the sun. Therefore, we can see the moon during the day, basically when the sun is about to set and the sky gradually becomes dark.
The gas particles in the earth's atmosphere are mainly nitrogen and oxygen. These gas molecules will scatter short-wave light, such as blue light and purple light. It is this scattering effect that makes the earth appear in a blue sky. If the moon wants to appear during the day, it must have enough brightness and be brighter than the sky brought by the sun.
When can I see the moon during the day?
According to astronomers' observations, in the year of Earth, there are only about 25 days to see the moon during the day, and the time when the moon appears during the day is generally around the full moon, and the closer the moon is to the Earth, the better. And during the year on Earth, the moon is more likely to be observed during the day in spring and autumn, because the daytime is shorter in winter and the moon appears above the horizon even shorter.
The moon can appear during the day, mainly relying on the sun's light. However, with the popularity of artificial lighting on the earth, astronomers have also observed the moon on the dark side during the day. The reason why the moon on the dark side can be observed is because the moon reflects the light of the earth.
This situation is very rare. This phenomenon can only be observed from the earth when the moon and the sun are close. This phenomenon generally occurs in the week after , the brightness of the earth is sufficient and the moon can reflect sufficient light, and the outline of the moon can be seen. If the moon does not reflect enough earth light, then only the shadow of the moon can be observed, but it is difficult for the naked eye to distinguish it in the sky.
In the solar system, only the sun and the earth can emit light at present. The sun uses its own nuclear fusion reaction to continuously release light and heat, while the earth relies on human technology to light up its own planet. The moon is located just between these two planets and can reflect light and become a bright celestial body on the earth's night.
Although the sun appears during the day and the moon appears at night, the brightness of the moon can occasionally surpass the sky, thus appearing in advance during the day. When have you ever seen the sun and the moon shine together?
