Le méridien de Paris est le méridien passant par le centre de l'Observatoire de Paris. Il est situé à 2°20'13,82" à l'est de celui de Greenwich . L'importance historique et scientifique du méridien de Paris est liée aux mesures d'arc de méridien qui lui correspondent : les mesures de la Méridienne de France. Ces mesures sont à l'origine du développement de la géodésie, ainsi que de la définition historique du mètre.
Source: Wikipedia.org
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