{"id":4072,"date":"2015-11-12T05:26:39","date_gmt":"2015-11-12T05:26:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4072"},"modified":"2015-11-19T05:44:03","modified_gmt":"2015-11-19T05:44:03","slug":"rotation-detoiles-autour-dune-statue","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/12\/rotation-detoiles-autour-dune-statue\/","title":{"rendered":"Rotation d’\u00e9toiles autour d’une statue"},"content":{"rendered":"

Une longue pose photographique en direction du p\u00f4le c\u00e9leste permet d’obtenir une rotation d’\u00e9toiles, preuve spectaculaire que la Terre tourne sur elle-m\u00eame.<\/strong><\/p>\n

Nos anc\u00eatres avaient remarqu\u00e9 que tous les astres semblent se mouvoir dans le ciel d’est en ouest : le Soleil <\/a>la journ\u00e9e, la Lune<\/a>, les \u00e9toiles <\/a>et les plan\u00e8tes <\/a>la nuit.<\/p>\n

Ce mouvement n’est qu’apparent : il trahit la rotation de la Terre sur elle-m\u00eame en 23 h 56 mn autour d\u2019un axe imaginaire qui passe par les p\u00f4les. Prolongeons cet axe imaginaire dans l\u2019espace en direction de la vo\u00fbte c\u00e9leste : dans l\u2019h\u00e9misph\u00e8re nord nous arrivons sur l\u2019\u00e9toile Alpha Ursae Minoris<\/em>, la plus brillante de la constellation de la Petite Ourse \u00e0 qui on a logiquement donn\u00e9 le nom d’\u00e9toile polaire<\/a>.<\/p>\n

\"rotation2\"<\/a><\/p>\n

L\u2019image ci-dessus aurait sans doute r\u00e9joui les astronomes <\/a>des si\u00e8cles pass\u00e9s, et bien qu’elle soit tr\u00e8s simple \u00e0 r\u00e9aliser, elle intrigue souvent le grand public.<\/p>\n

Il s’agit d’une rotation d’\u00e9toiles obtenue simplement en pointant l’appareil photographique en direction du p\u00f4le nord c\u00e9leste (l’\u00e9toile polaire est cach\u00e9e par la statue). Pendant la pose photographique, la rotation de la Terre a entra\u00een\u00e9 les \u00e9toiles d’est en ouest, provoquant ces arcs de cercle lumineux. Le petit trait rectiligne sous le visage de la statue est une \u00e9toile filante<\/a>.<\/p>\n

Les prises de vues ont \u00e9t\u00e9 faites au pied de la statue de la R\u00e9sistance r\u00e9alis\u00e9e par le sculpteur Paul Cabet (1815-1876) sur une colline \u00e0 Nuits-Saint-Georges.<\/p>\n

Ce clich\u00e9 est le r\u00e9sultat final d\u2019un assemblage de plusieurs dizaines d\u2019images \u00e0 l\u2019aide de Starmax<\/a>, un logiciel gratuit cr\u00e9\u00e9 par Gilbert Grillot et Sylvain Weiller qui permet d\u2019additionner des photos d\u2019\u00e9toiles. C’est le m\u00eame logiciel qui m’a permis de r\u00e9aliser une rotation d’\u00e9toiles au ch\u00e2teau de la Tour<\/a>\u00a0ainsi qu’une rotation d’\u00e9toiles dans le ciel de la Bresse<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Une longue pose photographique en direction du p\u00f4le c\u00e9leste permet d’obtenir une rotation d’\u00e9toiles, preuve spectaculaire que la Terre tourne sur elle-m\u00eame. Nos anc\u00eatres avaient remarqu\u00e9 que tous les astres semblent se mouvoir dans le ciel d’est en ouest : le Soleil la journ\u00e9e, la Lune, les \u00e9toiles et les plan\u00e8tes la nuit. Ce mouvement … Continuer la lecture de Rotation d’\u00e9toiles autour d’une statue<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":4077,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[296,98,146,722,1197,963],"class_list":["post-4072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-etoile-filante","tag-etoile-polaire","tag-nuits-saint-georges","tag-paul-cabet","tag-rotation-detoiles","tag-starmax"],"yoast_head":"\nRotation d'\u00e9toiles autour d'une statue<\/title>\n<meta name=\"description\" content=\"Une longue pose photographique en direction du p\u00f4le c\u00e9leste permet d'obtenir une rotation d'\u00e9toiles, preuve spectaculaire que la Terre tourne sur elle-m\u00eame.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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