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Zénithal

Le qualificatif zénithal (dérivé du mot zénith) spécifie la position du Soleil lorsqu'il est, étymologiquement, au-dessus de la tête de l'observateur. Ceci ne peut se produire qu’à 12 h 0 à l'équateur, cependant on utilise fréquemment ce terme pour indiquer que le Soleil est à son maximum diurne au-dessus de l'horizon[1].

Sur Terre, la position zénithale indique le sud dans l’hémisphère nord mais le nord dans l'hémisphère opposé.

Par extension

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Par extension on qualifie de zénithal quelque chose qui se trouve au-dessus de sa tête ou plus particulièrement au plafond (par exemple un éclairage zénithal[2])[1].

Notes et références

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  1. a et b zénithal, sur le site cnrtl.fr
  2. Cf. Musée des beaux-arts de Lyon par exemple

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Zénithal
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