For thousands of years, the sun has been emitting heat and light to the earth tirelessly. Because of this, there are night and day, intense heat and cold on the earth. Therefore, the night is naturally associated with cold, and the day symbolizes heat, hope and dreams.
The so-called twilight line is the boundary between the day hemisphere and the night hemisphere. And because of the wonderful scattering effect of the atmosphere, the twilight line is not a direct separation between night and day. There is always gray chaos between complete darkness and complete light.
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