File:Panneau 18e La mire du Nord.jpg

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Français : Panneau Histoire de Paris: Dès 1670, l’Académie des Sciences entreprend de mesurer la longueur du méridien de Paris, exprimée en toises et en degrés, de Dunkerque à Barcelone. L’abbé Jean Picard, directeur des travaux entre Paris et Amiens, fait planter ici le 14 août 1675 une sorte de pilier en bois baptisé « le poteau de la méridienne ». Repris par les Cassini, ces travaux servent de base à l’établissement d’une carte de France, et le poteau se trouve remplacé par une construction pyramidale en pierre, de trois mètres de haut, surmontée d’une fleur de lys. Un inscription précise : « L’an 1736, cet obélisque a été élevé par ordre du roi, pour servir d’alignement à la méridienne de Paris du côté du Nord. Son axe est à 2,931 toises 2 pieds de la face méridionale de l’Observatoire ».
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current16:37, 25 June 2021Thumbnail for version as of 16:37, 25 June 20211,365 × 2,048 (1.18 MB)Scarabocchio (talk | contribs)Uploaded own work with UploadWizard

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