Is the morning glow in the morning or in the evening?

Cai Xia is a natural phenomenon. When sunlight passes through the thick atmosphere before and after sunrise and sunset, it appears color due to scattering. Among them, the morning glow is the morning glow, commonly known as the morning glow, and the evening glow is the evening glow. The morning glow and sunset glow are caused by the scattering of light by air. When sunlight enters the atmosphere, it will scatter when it meets atmospheric molecules and particles suspended in the atmosphere.

These atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light source. After these rays are scattered by impurities such as air molecules and water vapor, the sky there will be colorful.

The interpretation of ancient meteorology to the morning glow;

"Don't go out at sunrise, travel thousands of miles at sunset" is a poetic proverb, which actually contains certain scientific truth. Because the morning glow is mostly caused by cumulus clouds, it is very easy to develop into cumulonimbus clouds. So it is easy to form rain for a period of time after sunrise. Sunset clouds are mostly light cumulus clouds, which will not cause precipitation, indicating that the weather will be fine in a certain range in the next few days, which is conducive to travel.

The ancients in our country were good at putting scientific truth in proverbs and poems to remind people to farm scientifically and travel at the right time. For example, there are proverbs related to clouds, such as "there must be a storm in the clouds coming from the northeast" and "there is a broom cloud in the sky, and it will rain for three days". These agricultural proverbs, like the twenty-four solar terms, are the natural laws that the ancient people of China have constantly summed up in their production and life practice for hundreds or even thousands of years.