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Resumé
BeschreiwungMeridiano.svg
Italiano: Sfera celeste, sono evidenziati i poli celesti e, in arancione, il meridiano. 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, il cerchio PZP'Z' il meridiano.
English: Celestial sphere, with poles and meridian. C is the center of the celestial sphere, O is the observer.
Déi Persoun, déi dëst Wierk mat dësem Dokument verbonn huet, iwwerléist der dëst Wierk Allgemengheet dëst Wierk, andeem si all Copyright-Rechter an all weider domat verbonne Rechter – am Kader vun de jeeweilege gesetzleche Bestëmmungen – opgëtt. D'Wierk kann – souguer fir kommerziell Zwecker – kopéiert, modifizéiert a viruverdeelt ginn, ouni datt dofir eng Autorisatioun gefrot muss ginn.
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==Summary== {{Information |Description={{it|Sfera celeste, sono evidenziati i poli celesti e, in arancione, il meridiano. 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