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Astronomski sumrak

Astronomski sumrak započinje ujutro kada je geometrijski centar Sunca 18˚ ispod horizonta i završava kada je geometrijski centar Sunca 12˚ ispod horizonta. Također započinje navečer kada je geometrijski centar Sunca 12˚ ispod horizonta i završava kada je geometrijski centar Sunca 18˚ ispod horizonta.

U ovim uvjetima horizont nije vidljiv, ali su vidljive blago sjajne zvijezde.

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