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Taevameridiaan on taevapooluseid ja seniite läbiv taevasfääri suurringjoon[1].
Vaatluskohta ja selle taevameridiaani läbivat tasandit nimetatakse meridiaanitasandiks[1]. Meridiaanitasandi suhtes määratakse ilmakaared[1].
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Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
