Can you see the sunrise on a cloudy morning?

Introduction to sunrise: refers to the appearance of the sun when it first rises above the horizon or is first seen. Generally, it refers to the time when the sun rises slowly from the eastern horizon, but it is actually defined as the moment when the sun just appears on the horizon, not the moment when the whole sun leaves the horizon.

Category: Meteorological phenomena.

Principle: At sunrise, sunlight is Rayleigh scattered by dust in the earth's atmosphere, so the sky will be filled with smog, but the smog at sunrise is more elegant than at sunset, because there is less dust in the atmosphere at sunrise than at sunset.

Time shift: In ancient China, a day was divided into twelve hours, and each hour was equivalent to two hours in modern times. Sunrise is the fourth hour of the day and night, which means 5 am to 7 am. The earthly branch was named Shi Mao.

Two-day sunrise: Ancient astronomers in China recorded a rare astronomical phenomenon, called "the sky rises again", which means that it appeared on the same day for two consecutive days. It is usually an astronomical spectacle caused by a total solar eclipse from 5 am to 7 am. At the first sunrise, the sky gradually darkened, and then the next sunrise came.

The time of sunrise: It varies with seasons and latitudes. Traditionally, in the northern hemisphere, the sunrise time from winter solstice is the latest, but in fact, the latest sunrise time should be 65438+1early October. The earliest sunrise is not in the summer solstice, but in early June. Even in the equatorial region, the time of sunrise and sunset will change a little during the year.