Astronomisk tussmørke

Astronomisk tussmørke skjer både om morgenen og kvelden (i tillegg har vi nautisk og alminnelig tussmørke). Om morgenen starter det når det geometriske senteret til solen står 18 grader under horisonten, og varer til sola står 12° under horisonten. Om kvelden starter det når det geometriske senteret til solen står 12° under horisonten og varer til sola står 18° under horisonten. Horisonten er ikke synlig for oss når det er astronomisk tussmørke, men vi kan se moderat lysende stjerner.

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