What does rainbow mean?

Rainbow (also known as Tiangong, Crossing Rainbow, Crimson, etc. ), referred to as rainbow, 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. From the outer ring to the inner ring, there are seven colors: red, orange, yellow, green, blue, indigo and purple. In fact, rainbows have countless colors. For example, there are many subtle differences between red and orange, but for simplicity, only seven colors are used as the differences.

Rainbow usually appears in the afternoon or when it clears up after rain, and its position will change with the observer's position.

Let's start with the definition:

In fact, as long as there are water droplets in the air and the sun shines behind the observer at a low angle, an observable rainbow phenomenon may occur. Rainbow usually appears in the afternoon when it just clears up after rain. At this time, the air is less dusty and full of small water droplets. One side of the sky is dark because there are still rain clouds, but the observer can see the sun without clouds above his head or behind him, so the rainbow will be easier to see. Another place where rainbows are often seen is near waterfalls. When the weather is clear, you can spray water or mist into the air with your back to the sun, or you can create an artificial rainbow.

Moon rainbow, also known as night rainbow, is a very rare phenomenon, which may appear in the night with strong moonlight. Because it is difficult for human vision to distinguish colors in the case of weak light at night, the night rainbow looks all white.

Look at the relevant culture again.

Because of the beauty of the rainbow and its incomprehensible phenomenon, the ancients used myths to explain the rainbow phenomenon on the earth, so the rainbow has a place in the myth. After Galileo studied the characteristics of light, the rainbow phenomenon can be explained.

1, in China mythology:

Nu Wa refined five-color stones to fill the sky, and the rainbow is the colorful light emitted by the five-color stones.

Rainbow (dragon), a kind of dragon.

In Greek mythology, Iris is the messenger of heaven and earth.

3. In Irish folklore, goblins put their treasures at the end of the rainbow.