Read and appreciate three sentences with different explanations in Reading Clouds to Know the Weather.

Cirrostratus, cirrostratus is about 5500-8000m above sea level.

If the thickening of cirrostratus decreases and the system develops, it shows that there is a weather system affecting the station, so the people have the saying that "the sun is dizzy at night on the third day, and the moon is dizzy at noon".

Around the sun and the moon, sometimes beautiful colored apertures appear, with red inner layers and purple outer layers. This aperture is called halo. Define it.