{"id":7877,"date":"2017-06-10T06:12:59","date_gmt":"2017-06-10T06:12:59","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7877"},"modified":"2017-06-19T17:17:31","modified_gmt":"2017-06-19T17:17:31","slug":"arc-en-ciel-dans-la-baie-de-douarnenez","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/10\/arc-en-ciel-dans-la-baie-de-douarnenez\/","title":{"rendered":"Arc-en-ciel dans la baie de Douarnenez"},"content":{"rendered":"<p><strong>Le jour se l\u00e8ve dans la baie de Douarnenez alors qu&#8217;un arc-en-ciel prend naissance dans la mer d&#8217;Iroise balay\u00e9e par des averses.<\/strong><\/p>\n<p>D\u00e9limit\u00e9e au NORD par la presqu&#8217;\u00eele de Crozon et au SUD par le cap Sizun, la baie de Douarnenez (la ville fut un grand port sardinier jusqu&#8217;\u00e0 la fin des ann\u00e9es 1970) trace un demi-cercle de plus de 16 kilom\u00e8tres de large sur 20 kilom\u00e8tres de profondeur qui s&#8217;ouvre sur la mer d&#8217;Iroise. C&#8217;est depuis les prairies de la commune de Plomodiern que cette image a \u00e9t\u00e9 r\u00e9alis\u00e9e \u00e0 l&#8217;aube du 20 mai.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez.jpg\" rel=\"lightbox[7877]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7878\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez-450x297.jpg\" alt=\"\" width=\"450\" height=\"297\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez-450x297.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez-768x506.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez-1024x675.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/05\/douarnenez.jpg 1365w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L\u2019arc-en-ciel a toujours fascin\u00e9 les hommes : 300 ans avant J.-C. le philosophe grec Aristote avait d\u00e9j\u00e0 remarqu\u00e9 que le rayon moyen de l\u2019arc primaire est de 41\u00b0 (51\u00b0 pour <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/09\/se-forme-double-arc-ciel\/\" target=\"_blank\" rel=\"noopener noreferrer\">l\u2019arc secondaire<\/a> invisible sur ce clich\u00e9).<!--more--><\/p>\n<p>Un peu plus tard c\u2019est Alexandre d\u2019Aphrodise qui nota que la zone comprise entre les deux arcs est plus sombre que le reste du ciel (en raison d\u2019un ph\u00e9nom\u00e8ne d\u2019interf\u00e9rence entre les rayons lumineux d\u00e9couvert par le physicien britannique George Airy), zone d\u00e9sormais appel\u00e9e bande d\u2019Alexandre.<\/p>\n<p>Au XI\u00e8me si\u00e8cle la d\u00e9couverte de la r\u00e9fraction par le math\u00e9maticien et physicien arabe Alhazen a permis de comprendre le principe de ce <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/22\/en-images-les-phenomenes-lumineux-atmospheriques\/\" target=\"_blank\" rel=\"noopener noreferrer\">photom\u00e9t\u00e9ore<\/a>. Plus tard le c\u00e9l\u00e8bre Isaac Newton a choisi arbitrairement de d\u00e9couper l\u2019arc-en-ciel en sept couleurs : rouge, orange, jaune, vert, bleu, indigo et violet (de l\u2019ext\u00e9rieur vers l\u2019int\u00e9rieur pour l\u2019arc primaire).<\/p>\n<p>En Europe une tradition veut que l\u2019on trouve un chaudron rempli d\u2019or au pied de l\u2019arc-en-ciel.<\/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>Le jour se l\u00e8ve dans la baie de Douarnenez alors qu&#8217;un arc-en-ciel prend naissance dans la mer d&#8217;Iroise balay\u00e9e par des averses. D\u00e9limit\u00e9e au NORD par la presqu&#8217;\u00eele de Crozon et au SUD par le cap Sizun, la baie de Douarnenez (la ville fut un grand port sardinier jusqu&#8217;\u00e0 la fin des ann\u00e9es 1970) trace &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/10\/arc-en-ciel-dans-la-baie-de-douarnenez\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Arc-en-ciel dans la baie de Douarnenez<\/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":7878,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[262,2227,2230,2228,2229,520,2231],"class_list":["post-7877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-arc-en-ciel","tag-baie-de-douarnenez","tag-cap-sizun","tag-crozon","tag-douarnenez","tag-photometeore","tag-plomodiern"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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