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Amurgul astronomic

Amurgul astronomic începe dimineața când centrul geometric al Soarelui este la 18 grade sub orizont și se termină atunci când centru geometric al Soarelui este la 12 grade sub orizont. Începe seara, când centrul geometric al Soarelui este cu 12 grade sub orizont și se termina atunci când centrul geometric al Soarelui este cu 18 grade sub orizont.

Orizontul nu este vizibil în aceste condiții, dar pot fi văzute stele iluminate moderat.

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