{"id":22419,"date":"2026-03-01T21:36:16","date_gmt":"2026-03-01T20:36:16","guid":{"rendered":"https:\/\/reperes-astro.fr\/?p=22419"},"modified":"2026-03-01T21:36:21","modified_gmt":"2026-03-01T20:36:21","slug":"astronomie-parisienne-depuis-les-hauteurs","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/astronomie-parisienne-depuis-les-hauteurs\/","title":{"rendered":"Astronomie parisienne depuis les hauteurs"},"content":{"rendered":"\n<p>Voici quelques hauts lieux de l&rsquo;Astronomie parisienne, tels que vous pouvez les observer du haut de la <strong>Tour Montparnasse<\/strong>.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\"><strong>Attention, si vous \u00eates tent\u00e9s, cela ne sera plus possible apr\u00e8s le 31 mars 2026, et ce, pendant au moins quatre ann\u00e9es de travaux.<\/strong><\/mark><\/p>\n\n\n\n<p>Nous y sommes all\u00e9s samedi 28 f\u00e9vrier 2026, avec une m\u00e9t\u00e9o assez cl\u00e9mente.<\/p>\n\n\n\n<p>Cette liste par ailleurs est tr\u00e8s loin d\u2019\u00eatre exhaustive, et je ne parlerai que de ce que j\u2019ai pu photographier (Avec l\u2019\u00e9crasement de perspective, je n\u2019ai par exemple pas trouv\u00e9 les coupoles de la rue Serpente ni l\u2019Institut de France).<\/p>\n\n\n\n<p>Si le sujet vous int\u00e9resse, je vous conseille le tr\u00e8s bon <strong><a href=\"https:\/\/www.thebookedition.com\/fr\/29736_sebastien-beaucourt\">Guide du patrimoine astronomique de Paris<\/a><\/strong>, par S\u00e9bastien Beaucourt, publi\u00e9 \u00e0 compte d\u2019auteur, lequel auteur travaille \u00e0 l\u2019observatoire de Reims. J\u2019y ai trouv\u00e9 les informations qui suivent.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Le Louvre<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/louvre-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"232\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/louvre-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22420\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/louvre-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/louvre-paris-300x70.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/louvre-paris-768x178.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Commen\u00e7ons par <strong>Le Louvre<\/strong>, car dans la cour des pyramides nous pouvons admirer les statues de Lalande (qui mesura la distance Terre-Lune avec La Caille), de Cassini I et de l\u2019architecte Claude Perrault (1613-1688) (fr\u00e8re de Charles, le p\u00e8re du petit chaperon rouge), qui dessina les plans de l\u2019observatoire de Paris.<\/p>\n\n\n\n<p>C\u2019est au Louvre que naquit aussi <strong><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Jean_Sylvain_Bailly\">Jean-Sylvain Bailly<\/a> (1736-1793)<\/strong>, qui construisit sur les toits son observatoire personnel.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">L\u2019H\u00f4tel de ville<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/mairie-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"230\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/mairie-paris.jpg\" alt=\"\" class=\"wp-image-22421\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/mairie-paris.jpg 800w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/mairie-paris-300x86.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/mairie-paris-768x221.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>On le retrouve parmi les statues de la fa\u00e7ade de <strong>l\u2019H\u00f4tel de Ville<\/strong>, dont il fut le premier maire \u00e0 la R\u00e9volution. A noter \u00e9galement, les statues de Jean-Baptiste Biot (1774-1862), qui le premier d\u00e9montra l\u2019origine c\u00e9leste des m\u00e9t\u00e9orites, ainsi que de Cassini III et de L\u00e9on Foucault (1819-1868).<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Le Panth\u00e9on<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/pantheon-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/pantheon-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22422\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/pantheon-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/pantheon-paris-300x200.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/pantheon-paris-768x512.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>L\u00e9on Foucault dont le pendule oscille sous la coupole du <strong>Panth\u00e9on. <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Jean-Baptiste_Joseph_Delambre\">Jean-Baptiste DELAMBRE<\/a><\/strong> (1749-1822) s\u2019installa par ailleurs en 1793 dans la lanterne sommitale pour r\u00e9aliser la triangulation du m\u00e9ridien de Paris.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">L\u2019observatoire de Paris<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/observatoire-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"514\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/observatoire-paris.jpg\" alt=\"\" class=\"wp-image-22423\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/observatoire-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/observatoire-paris-300x154.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/observatoire-paris-768x395.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Ce m\u00e9ridien de Paris est symbolis\u00e9 par l\u2019avenue de <strong>l\u2019Observatoire<\/strong>, bien qu\u2019il y ait un l\u00e9ger d\u00e9calage \u00e0 l\u2019Est par rapport \u00e0 la ligne Dunkerque-Barcelone. L\u2019Observatoire et sa coupole Arago est toujours en fonction, et abrite des locaux de l\u2019IMCCE, anciennement d\u00e9nomm\u00e9 bureau des longitudes.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Le P\u00e8re Lachaise<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-pere-lachaise-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"310\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-pere-lachaise-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22425\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-pere-lachaise-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-pere-lachaise-paris-300x93.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-pere-lachaise-paris-768x238.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>Poursuivons avec le cimeti\u00e8re du p\u00e8re Lachaise<\/strong>, ou reposent <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Fran%C3%A7ois_Arago\"><strong>Fran\u00e7ois Arago<\/strong><\/a> (1786-1853) et <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Jules_Janssen\"><strong>Jules Janssen<\/strong><\/a> (1824-1907).<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">La Concorde<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/concorde-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"351\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/concorde-paris.jpg\" alt=\"\" class=\"wp-image-22426\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/concorde-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/concorde-paris-300x105.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/concorde-paris-768x270.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>Continuons avec la place de la concorde,<\/strong> qui est en fait un cadran solaire dont l\u2019ob\u00e9lisque joue le r\u00f4le de style depuis le 21 juin 1999. Cela est purement symbolique, car m\u00eame si toutes les heures sont marqu\u00e9es au sol, il faudrait que l\u2019ob\u00e9lisque soit orient\u00e9 vers la polaire pour donner une heure correcte&nbsp;!<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">La Sorbonne<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/sorbonne-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"418\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/sorbonne-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22427\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/sorbonne-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/sorbonne-paris-300x125.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/sorbonne-paris-768x321.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Vient ensuite<strong> l\u2019observatoire de la Sorbonne<\/strong>, avec sa tour qui culmine \u00e0 40 m\u00e8tres, et dans laquelle vous trouverez la lunette de 153mm de diam\u00e8tre de la Soci\u00e9t\u00e9 Astronomique de France. A noter que vous pouvez y faire des observations, sur r\u00e9servation.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Saint Sulpice<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/saint-sulpice-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"446\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/saint-sulpice-paris.jpg\" alt=\"\" class=\"wp-image-22428\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/saint-sulpice-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/saint-sulpice-paris-300x134.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/saint-sulpice-paris-768x343.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>L\u2019\u00e9glise Saint Sulpice<\/strong>, o\u00f9 se trouve le fameux Gnomon, aiguille int\u00e9rieure qui se poursuit par une ligne m\u00e9ridienne en laiton incrust\u00e9e dans le sol sur 40 m\u00e8tres de long. Chaque jour \u00e0 midi vrai, les rayons solaires passent par un vitrail en haut du transept sud, et une tache se forme alors sur la m\u00e9ridienne. Le 21 juin la tache atteint une dalle au sol, sur laquelle il est fait mention de la position qu\u2019elle avait le 21 juin 1745.<\/p>\n\n\n\n<p>En comparant avec le relev\u00e9 contemporain, cela permet 1\u00b0) de constater la variation de l\u2019inclinaison de la Terre (45 secondes d\u2019arc par si\u00e8cle), et 2\u00b0) en relevant cette fois chaque ann\u00e9e la position au jour de l\u2019\u00e9quinoxe de Printemps, de calculer la pr\u00e9cession des \u00e9quinoxes. Tels furent les travaux de <strong><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Pierre_Charles_Le_Monnier\">Pierre Charles Le Monnier (1715-1799<\/a>)<\/strong>, qui pendant dix-huit ans constata un d\u00e9calage\u2026de 1mm par an, pour ainsi d\u00e9montrer l\u2019obliquit\u00e9 de l\u2019\u00e9cliptique.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">La Tour Eiffel, premier niveau<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"488\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22429\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-300x146.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-768x375.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><strong>Le premier \u00e9tage de La Tour Eiffel<\/strong>, sur laquelle sont inscrits les noms de Lalande, Lagrange, Laplace, Foucault, Delaunay, Arago, Daguerre, Le Verrier, Delambre, et Borda.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">L\u2019\u00e9metteur radio<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-thumbnail\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-1-150x150.jpg\" alt=\"\" class=\"wp-image-22430\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-1-150x150.jpg 150w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-1-80x80.jpg 80w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/tour-eiffel-paris-1-320x320.jpg 320w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Par ailleurs, du <strong>troisi\u00e8me \u00e9tage<\/strong> \u00e9tait envoy\u00e9e autrefois (par ondes radio et en morse) l\u2019heure exacte de Paris. C\u2019est <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Robert_Jonckh%C3%A8ere\"><strong>Robert Jonckheere<\/strong><\/a> (1888-1974) qui se chargeait de la recevoir \u00e0 l\u2019observatoire de Hem, pour r\u00e9gler ensuite depuis son horloge m\u00e8re, toutes les horloges filles de l\u2019agglom\u00e9ration lilloise (Son r\u00e9cepteur est toujours conserv\u00e9 dans les locaux de Lille o\u00f9 r\u00e9side \u00e9galement sa fameuse lunette). Parfois au contraire, il rectifiait l\u2019heure de Paris gr\u00e2ce \u00e0 sa lunette m\u00e9ridienne personnelle.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Le jardin des plantes, Museum d\u2019histoire naturelle<\/span><\/strong><\/em><\/h2>\n\n\n\n<p>Au <strong>jardin des plantes<\/strong>, en cherchant bien on trouvera le cadran solaire qui orne la fa\u00e7ade de la maison du naturaliste Georges Cuvier (1769-1832).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/jardin-plantes-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"327\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/jardin-plantes-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22431\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/jardin-plantes-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/jardin-plantes-paris-300x98.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/jardin-plantes-paris-768x251.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">Le cimeti\u00e8re Montparnasse<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-montparnasse-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"558\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-montparnasse-paris.jpg\" alt=\"\" class=\"wp-image-22432\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-montparnasse-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-montparnasse-paris-300x167.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/cimetiere-montparnasse-paris-768x429.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Urbain Le Verrier, qui d\u00e9couvrit Neptune par ses seuls calculs, repose dans la 11<sup>\u00e8me<\/sup> division du <strong>cimeti\u00e8re Montparnasse<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><em><strong><span style=\"text-decoration: underline;\">L\u2019arc de Triomphe<\/span><\/strong><\/em><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/arc-triomphe-paris.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"391\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/arc-triomphe-paris.jpg\" alt=\"Astronomie parisienne depuis les hauteurs\" class=\"wp-image-22433\" style=\"width:633px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/arc-triomphe-paris.jpg 1000w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/arc-triomphe-paris-300x117.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/03\/arc-triomphe-paris-768x300.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Et pour le fun, n\u2019oubliez pas votre photo annuelle de la Lune ou du Soleil \u00e0 travers l\u2019Arc de triomphe&nbsp;!<\/p>\n\n\n\n<p class=\"has-text-align-right\"><strong>Axel GUILLERAND.<\/strong><\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_22419\" class=\"pvc_stats all  \" data-element-id=\"22419\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 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Attention, si&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_22419\" class=\"pvc_stats all  \" data-element-id=\"22419\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":14,"featured_media":22433,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14,49],"tags":[],"class_list":["post-22419","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documentation","category-observations","category-informations-a-destination-des-enseignants-et-des-animateurs"],"a3_pvc":{"activated":true,"total_views":50,"today_views":0},"yoast_head":"<title>Astronomie parisienne depuis les hauteurs - 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