What did the appearance of a moon halo indicate in ancient times?

Whenever you look up at the sky on a clear night, you can always find the moon hanging high in the sky, emitting a soft light. Sometimes you can also see a beautiful halo around the moon. This phenomenon is relatively rare, so the ancients gave the moon halo a special meaning.

What did the appearance of a moon halo represent in ancient times?

1. The first theory is that if a hairy moon, or a halo, appears, such a night is unlucky. Such nights are when ghosts and spirits come out, so people are better off avoiding them and not going out casually.

2. The second theory is that more moon halos indicate that it will be windy. Sometimes there will be gaps in the moon halo, and the direction of the gap is the direction of the wind. Therefore, there are folk proverbs: "Sun halo means rain at midnight, moon halo means wind at noon" and "Moon halo means wind, moist ground means rain."

Scientific explanation for lunar halos

1. Solar halos and lunar halos are both formed by refraction of ice crystals, which is the same principle that causes rainbows. There is a folk saying: "A halo around the sun means rain at midnight, and a halo around the moon means wind at noon."
2. The lunar halo is when light passes through high-altitude cirrostratus clouds and is refracted by ice crystals. The seven-color composite light is dispersed into red and purple rings or arcs, creating an aperture around the moon.
3. Dizziness can be divided into "minor dizziness" and "major dizziness". "Minor dizziness" refers to dizziness of 22 degrees, and "major dizziness" refers to dizziness of 46 degrees. The small halo is a circle with a luminous body as the center, an angular radius of 22 degrees, and a light red inner circle. The outer circle is occasionally purple or white. The sky inside the halo is obviously darker than that outside the halo. A large halo is a halo with an angular radius of 46 degrees. It is very rare and generally darker than a small halo.
4. The lunar halo was called "hairy moon" in ancient times, and in some places it was called "wind circle".