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Crépuscule

Le crépuscule est la période entre le coucher du soleil et la nuit, et aussi entre la nuit et le lever du Soleil, quand le Soleil est au-dessous de l’horizon, mais l’atmosphère est éclairée par le Soleil. Cet effet d’illumination est le résultat du fait que la lumière du soleil est diffusée par la haute atmosphère.

Il existe trois types de crépuscule, définis par la distance du soleil au-dessous de l’horizon: crépuscule civil, crépuscule nautique et crépuscule astronomique.

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