The rainbow in the morning sky shows the weather.

If there is a rainbow in the west, it means there are clouds and rain in the west, and it will soon move eastward and rain. If there is a rainbow in the east, it means that the cloud and rain belt has moved away and sunny days are coming.

Rainbow, also known as Tiangong (Hakka), crosses the rainbow, blushes, etc. , is an optical phenomenon in meteorology. When sunlight hits the water droplets in mid-air, the light is refracted and reflected, forming an arched colorful spectrum in the sky, which is red, orange, yellow, green, blue, indigo and purple in turn from the outer ring to the inner ring. Wear eight colors. In fact, rainbows have countless colors.

Extended data:

The principle of rainbow

1, the French scientist Descartes was the first to study rainbows. 1637, he published an article explaining that rainbows are formed by sunlight refracting and reflecting into water droplets in the air. But he doesn't know the color of Bai Hong, and he doesn't know why they are arranged in a certain order. It was not until Newton's prism experiment that the color of the rainbow was explained.

2. Shen Kuo wrote in Meng Qian's Bi Tan that "Hong, Japan, China and Shui Ying are also. Sunshine, rain and dew, both. " ? "Color" means many colors. The word "work" in the word "rainbow" means "artificial" and extends to the meaning of "regularity"; "Worm" means "dragon", and the combination of "worm" and "work" means "dragon absorbs water". Therefore, the rainbow is commonly known as "lever draft" and "dragon water absorption" among the people. People used to think that rainbows would suck water away, so when rainbows came, people would knock on pots and bowls to "scare away" rainbows.

References:

Baidu encyclopedia-meteorological proverbs

References:

Baidu encyclopedia-rainbow