{"id":6085,"date":"2016-07-20T12:21:38","date_gmt":"2016-07-20T12:21:38","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6085"},"modified":"2016-07-28T07:22:15","modified_gmt":"2016-07-28T07:22:15","slug":"pleine-lune-cerf-ceinture-de-venus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/20\/pleine-lune-cerf-ceinture-de-venus\/","title":{"rendered":"La Pleine Lune du cerf dans la ceinture de V\u00e9nus"},"content":{"rendered":"<p><strong>Retour sur le lever de Pleine Lune du 19 juillet qui nous permet de d\u00e9couvrir la ceinture de V\u00e9nus, une \u00e9tonnante bande de ciel rose au-dessus de l&#8217;horizon.<\/strong><\/p>\n<p>Si vous avez suivi le lever de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/18\/admirez-pleine-lune-cerf-19-juillet\/\" target=\"_blank\">Pleine Lune du cerf<\/a> dans la soir\u00e9e du mardi 19 juillet, peut-\u00eatre avez-vous remarqu\u00e9 que le ciel pr\u00e9sentait diff\u00e9rentes teintes sous forme de bandes horizontales. Je vous propose de les d\u00e9couvrir \u00e0 partir de l&#8217;image ci-dessous que j&#8217;ai r\u00e9alis\u00e9e environ 20 minutes apr\u00e8s le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/04\/coucher-soleil-tache\/\" target=\"_blank\">coucher du Soleil<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2.jpg\" rel=\"lightbox[6085]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6087\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2-450x300.jpg\" alt=\"ceinture_venus2\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2-768x513.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2-1024x684.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/ceinture_venus2.jpg 1348w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>En commen\u00e7ant au ras de l&#8217;horizon on voit une bande fonc\u00e9e (appel\u00e9e\u00a0couche sombre ou segment sombre) qui est en fait la projection de l&#8217;ombre de la Terre sur son atmosph\u00e8re (elle devient visible quand le Soleil est pass\u00e9 sous l&#8217;horizon oppos\u00e9).<!--more--><\/p>\n<p>Juste au-dessus de cette couche sombre se trouve l&#8217;arche anticr\u00e9pusculaire qui porte aussi le doux nom de ceinture de V\u00e9nus. Cette bande d\u00e9licatement ros\u00e9e est produite par les derniers rayons du Soleil qui sont renvoy\u00e9s dans sa direction (et donc dans celle de l&#8217;observateur qui est dos au Soleil couchant) par l&#8217;atmosph\u00e8re terrestre (on parle de r\u00e9trodiffusion).<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/160503656\" width=\"640\" height=\"480\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>La ceinture de V\u00e9nus peut \u00eatre admir\u00e9e r\u00e9guli\u00e8rement \u00e0 l&#8217;aube comme au cr\u00e9puscule. Il faut pour cela disposer d&#8217;un ciel pur et la rechercher dans la direction oppos\u00e9e au Soleil pendant une vingtaine de minutes le soir apr\u00e8s son coucher ou le matin avant son lever. Il est int\u00e9ressant de photographier le ciel \u00e0 intervalles r\u00e9guliers car la couleur de la ceinture de V\u00e9nus varie assez rapidement : si le Soleil est trop loin sous l&#8217;horizon elle perd ses couleurs et s&#8217;il est trop pr\u00e8s le ciel est trop lumineux pour la percevoir.<\/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>Retour sur le lever de Pleine Lune du 19 juillet qui nous permet de d\u00e9couvrir la ceinture de V\u00e9nus, une \u00e9tonnante bande de ciel rose au-dessus de l&#8217;horizon. Si vous avez suivi le lever de la Pleine Lune du cerf dans la soir\u00e9e du mardi 19 juillet, peut-\u00eatre avez-vous remarqu\u00e9 que le ciel pr\u00e9sentait diff\u00e9rentes &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/20\/pleine-lune-cerf-ceinture-de-venus\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La Pleine Lune du cerf dans la ceinture de V\u00e9nus<\/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":6086,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[1762,125,1761,1753,1763,97],"class_list":["post-6085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-arche-anticrepusculaire","tag-atmosphere","tag-ceinture-de-venus","tag-pleine-lune-du-cerf","tag-retrodiffusion","tag-soleil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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