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Constellation knowledge is the moon halo, wind and rain.

Both solar and lunar halos are optical phenomena. The aperture around the sun appears solar halo, and the aperture around the moon is called lunar halo, so the following constellation knowledge reveals the meaning of lunar halo and wind-based rain! Let's have a look!

The meteorological proverb "the moon is dizzy, the wind is moist, and the rain is moist" refers to the weather change, which means that the moon shines on the clouds and there is a halo, so there will be wind; When the cornerstone is wet, it will rain.

Appearance image halo is usually annular or arc-shaped, with seven colors: red, orange, yellow, green, blue, indigo and purple. Before the weather changes, we sometimes see one or more colored or white apertures around the moon, and the sunlight and moonlight seem dim.

The appearance of solar or lunar halos often indicates that the weather will change to some extent. Generally, a solar halo means it may rain, and a lunar halo means it will be windy. Sometimes there is a gap in the lunar halo, and the direction of the gap is the direction of the wind. Therefore, there is a folk proverb: "It rains at night when the sun is dizzy, and it is windy at noon when the moon is dizzy" and "It rains when the moon is dizzy". Cirrostratus itself will not produce rain, but it may rain in the middle and low clouds, and there is a lot of water. This is why we say that it will rain at night when the sun is dizzy, and it will be windy and rainy at noon when the moon is dizzy. Is dizziness bound to wind and rain? Not necessarily. Whether it is windy or rainy depends on how the low and middle clouds develop in cirrostratus. If they continue to develop, the clouds will increase and thicken, and it will be windy and rainy. Whether it is dizziness for several days in a row or a flash in the pan, it depends on the development speed of low and medium clouds after dizziness. The development of middle and low clouds moves in quickly, and precipitation comes quickly; If the development is slow, the precipitation will come late; If you don't move in, there will be no precipitation.

In photography, halo refers to the optical effect caused by carelessness, which is caused by the reflected light in the initial exposure of the negative, or the aperture formed by the edge of the light source or the anti-light source in the image printed by this roll of negative. Modern photographic negatives will be covered with "anti-halo layer" to prevent this effect.

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