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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.
This project (EDU-ARCTIC) has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 710240. The content of the website is the sole responsibility of the Consortium and it does not represent the opinion of the European Commission, and the Commission is not responsible for any use that might be made of information contained.