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Nautisk tussmørke

Nautisk tussmørke skjer både om morgenen og kvelden (i tillegg har vi astronomisk tussmørke og alminnelig tussmørke). Det starter om morgenen når det geometriske senteret til solen er 12 grader under horisonten og varer til solen står 6° under horisonten. Det starter om kvelden når det geometriske sentrum av den solen er 6° under horisonten og var til solen står 12° under horisonten. Vi sier «nautisk» tussmørke fordi dette er den tiden av døgnet da sjømenn lettest kan navigere, da både stjerner og horisonten er synlige.

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