Crépuscule astronomique

Le crépuscule astronomique commence le matin quand le centre géométrique du soleil est 12 degrés au-dessous de l’horizon et se termine quand le centre géométrique du soleil est 18 degrés au-dessous de l’horizon. Il commence le soir quand le centre géométrique du soleil est 12 degrés au-dessous de l’horizon et se termine quand le soleil est 18 degrés au-dessous de l’horizon.

L’horizon n’est pas visible dans ces conditions, mais des étoiles moyennement brillantes peuvent déjà être vues.

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