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astromomski sumrak
The time when the Sun is 12-18 degrees below the horizon. When the Sun moves from 19 to 18 degrees below the horizon, astronomers can begin to detect an increase in the brightness of the sky, although to the naked eye the sky still looks dark.
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- Categoria gramatical: noun
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- Actividade/ Sector: Astronomy
- Category: Planetary science
- Company: PSRD
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