Meridianu
| Meridianu | |
|---|---|
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half of great circle (en) | |
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Los meridianos son los círculos imaxinarios máximos que pasen pelos Polos.
Ente los infinitos meridianos distínguese especialmente'l Meridianu del llugar, que ye'l que pasa pel puntu au s'alluga l'observador. Suponiendo que l'observador ta nel puntu "O", el meridianu ye'l Pn-O-Ps-Pn.
Los Polos dividen esti meridianu en dos partes, la metada que pasa pol observador (Pn-O-Ps) nómase Meridianu Superior, a la otra metada nómase Meridianu Inferior. Polo xeneral, cuando falamos namái de meridianu tamos refiriéndonos al meridianu superior.
Primer meridianu: Ye'l meridianu que se toma como orixe para midir les llonxitúes; anguaño ye'l Meridianu de Greenwich, nomáu asina por pasar pel observatoriu d'esa ciudá inglesa. Poro, ye lo mesmo falar de Primer Meridianu que de Meridianu de Greenwich.
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