Is the direction of the rainbow related to the position of the sun? Can its position predict the weather?

The meteorological principle of the rainbow

The size of the small water droplets in the air determines the color and width of the rainbow. The larger the raindrop, the narrower the rainbow band and the more vivid the color; the smaller the raindrop, the wider the rainbow band and the darker the color. When the raindrops are small enough, the light splitting and reflection are not obvious, and the rainbow disappears. This shows that the formation of rainbows is directly related to the existence, number, and size of raindrops in the air. In turn, rainbows are related to weather changes. For example, if the color of the rainbow changes from bright to dull, and the width changes from narrow to wide, it means that the raindrops in the air gradually become smaller. From this, we can speculate that the air may gradually become stable and the weather conditions will gradually become stable.

For thousands of years, the working people of our country have accumulated and spread many sky-viewing experiences related to rainbows in their long-term life and production practices, and have compiled them into proverbs in simple language. These proverbs reflect the objective laws of weather changes and have become one of the basis for people to speculate on future weather changes. For example, "East rainbow sun, west rainbow rain" (or early rainbow rain, late rainbow clear) predicts future weather changes based on the appearance of rainbows. The rainbow is in the west, which means there are a lot of raindrops in the atmosphere in the west. As the weather system moves eastward, there will be rain locally. Western rainbows usually appear in the morning. If the rainbow is in the east, it means that there are raindrops in the atmosphere in the east, the weather system has moved over the local area, and the weather is about to clear up. Eastern rainbows usually appear in the evening. Another example: "When the rainbow is late and the sun is low, it rains early; when the rainbow is high and the sun is low, we wear a raincoat in the morning and evening; when the rainbow is high and the sun is low, the water covers the stream; when a broken rainbow is seen, the wind will follow it; when a broken rainbow is seen early, it will be seen by wind and rain; A rainbow eats a cloud with one finger, and a cloud eats a rainbow with a foot of the sky." These are all weather proverbs related to rainbows.