{"id":643,"date":"2014-07-07T19:29:13","date_gmt":"2014-07-07T19:29:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=643"},"modified":"2014-07-18T09:16:11","modified_gmt":"2014-07-18T09:16:11","slug":"lunette-astronomique","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/07\/07\/lunette-astronomique\/","title":{"rendered":"La lunette astronomique"},"content":{"rendered":"<p>Bien que les lunettes d&#8217;approche soient apparues sans doute vers 1550 pour les besoins militaires, l&#8217;astronome italien Galil\u00e9e fut le premier \u00e0 en tourner une vers le ciel \u00e0 partir de 1609.<\/p>\n<p>Il d\u00e9couvrit avec les crat\u00e8res sur la <a title=\"Lune dominicale\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/15\/lune-dominicale\/\" target=\"_blank\">Lune<\/a>, les phases de <a title=\"Sa majest\u00e9 V\u00e9nus\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/23\/majeste-venus\/\" target=\"_blank\">V\u00e9nus<\/a> et les satellites de <a title=\"Jupiter dans les G\u00e9meaux\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/21\/jupiter-les-gemeaux\/\" target=\"_blank\">Jupiter <\/a>par exemple.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/07\/lunette.jpg\" rel=\"lightbox[643]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-644\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/07\/lunette-450x337.jpg\" alt=\"lunette\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/07\/lunette-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/07\/lunette-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/07\/lunette.jpg 1600w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Alors que les <a title=\"En images : les t\u00e9lescopes des amateurs\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/14\/en-images-les-telescopes-amateurs\/\" target=\"_blank\">t\u00e9lescopes <\/a>sont des r\u00e9flecteurs (la lumi\u00e8re est renvoy\u00e9e et concentr\u00e9e au foyer par un miroir), la lunette astronomique est un r\u00e9fracteur (les rayons lumineux convergent au foyer apr\u00e8s avoir travers\u00e9 une ou plusieurs lentilles qui forment l&#8217;objectif).<\/p>\n<p><!--more-->Autrefois les lunettes compensaient leur m\u00e9diocre qualit\u00e9 optique par des focales d\u00e9mesur\u00e9es, \u00e0 l&#8217;image des grandes lunettes (voir celles construites \u00e0 l&#8217;observatoire de <a title=\"L\u2019Observatoire de Strasbourg\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/19\/lobservatoire-strasbourg\/\" target=\"_blank\">Strasbourg<\/a> ou celui de <a title=\"L\u2019Observatoire de Meudon\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/26\/lobservatoire-meudon\/\" target=\"_blank\">Meudon<\/a>).<\/p>\n<p>Aujourd&#8217;hui ces instruments sont devenus tr\u00e8s performants gr\u00e2ce \u00e0 l&#8217;utilisation de verres sp\u00e9ciaux et les astronomes amateurs sont nombreux \u00e0 en poss\u00e9der.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Bien que les lunettes d&#8217;approche soient apparues sans doute vers 1550 pour les besoins militaires, l&#8217;astronome italien Galil\u00e9e fut le premier \u00e0 en tourner une vers le ciel \u00e0 partir de 1609. Il d\u00e9couvrit avec les crat\u00e8res sur la Lune, les phases de V\u00e9nus et les satellites de Jupiter par exemple. Alors que les t\u00e9lescopes &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/07\/07\/lunette-astronomique\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La lunette astronomique<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[94,158,90,259,82,148,104,260,152,96,159],"class_list":["post-643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-astronome","tag-galilee","tag-jupiter","tag-lumiere","tag-lune","tag-lunette-astronomique","tag-observatoire","tag-reflecteur","tag-refracteur","tag-telescope","tag-venus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La lunette astronomique<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/07\/07\/lunette-astronomique\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La lunette astronomique\" \/>\n<meta property=\"og:description\" content=\"Bien que les lunettes d&#8217;approche soient apparues sans doute vers 1550 pour les besoins militaires, l&#8217;astronome italien Galil\u00e9e fut le premier \u00e0 en tourner une vers le ciel \u00e0 partir de 1609. 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