Građanski sumrak

Ujutro građanski sumrak počinje kada je geometrijsko središte Sunca 6 stupnjeva ispod horizonta i traje do izlaska sunca. Navečer sumrak počinje zalaskom sunca i završava kada je Sunčev geometrijski centar 6 stupnjeva ispod horizonta.

Tijekom civilnog sumraka, vidljive su samo najsjajnije zvijezde kao i horizont i zemaljski predmeti, tako da obično nema potrebe za umjetnom rasvjetom.

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