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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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Pramonės šaka / sritis: Chemistry Category: General chemistry

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An entity that when applied to a mass causes it to accelerate. Sir Isaac Newton's Second Law of Motion states: the magnitude of a ...