File:Calotte celesti visibile e invisibile.svg

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Italiano: Sfera celeste, sono evidenziate le calotte di perpetua visibilità e di perpetua invisibilità. P è il polo celeste elevato, P' il polo celeste depresso, Z lo Zenith, Z' il Nadir, C il centro della Terra e della sfera celeste, O l'osservatore sulla superficie terrestre.
English: Celestial sphere, with poles. C is the center of the celestial sphere, O is the observer.
Deutsch: Himmelskugel mit Himmelspole, O ist der Beobachter, Z ist der Zenit, Z' ist Nadir, P ist der Himmelsnordpol, P' ist der Himmelssüdpol
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current20:58, 9 December 2006Thumbnail for version as of 20:58, 9 December 2006670 × 700 (22 KB)Cav~commonswiki (talk | contribs)==Summary== {{Information |Description={{it|Sfera celeste, sono evidenziate le calotte di perpetua visibilità e di perpetua invisibilità. P è il polo celeste elevato, P' il polo celeste depresso, Z lo Zenith, Z' il Nadir, C il centro della Terra e dell

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