Are dawn time and sunrise time the same concept?
Sunrise time refers to the time when the sun rises from the eastern horizon every day. Dawn is due to the refraction of sunlight by the atmosphere, and the time of dawn and sunrise is not exactly the same. When the weather is fine, the sun will dawn at 6 below the horizon.
Extended data:
Difference of sunrise time:
The time of sunrise will change with the season and the latitude of different places. 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. By the same token, the earliest sunrise on the solstice is not in summer, but in early June. Even in the equatorial region, the time of sunrise and sunset will change a little during the year.
These changes can be represented by daily trajectories. The time of sunrise and sunset can be calculated by tracking the sun's trajectory, but the calculated time will be slightly different from the real feeling, the calculated sunshine time will be longer than the real feeling, and the calculated night time will be shorter than the real feeling.
Because sunlight is refracted by the influence of the earth's atmosphere, people have seen the sunrise before the sun rises above the horizon, which is an illusion generated at sunrise every day.
Astronomers in ancient China recorded a rare astronomical phenomenon called "the sky rises again", which means that it appears for two days in a row on the same day. 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.
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