{"id":3201,"date":"2015-07-25T05:06:30","date_gmt":"2015-07-25T05:06:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3201"},"modified":"2015-07-31T05:34:29","modified_gmt":"2015-07-31T05:34:29","slug":"zoom-sur-la-grande-ourse-un-soir-dete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/25\/zoom-sur-la-grande-ourse-un-soir-dete\/","title":{"rendered":"Zoom sur la Grande Ourse un soir d’\u00e9t\u00e9"},"content":{"rendered":"

L’\u00e9t\u00e9 est la saison id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la c\u00e9l\u00e8bre constellation de la Grande Ourse une fois la nuit tomb\u00e9e.<\/strong><\/p>\n

La troisi\u00e8me plus grande constellation du ciel est celle de la Grande Ourse<\/a>, souvent r\u00e9duite \u00e0 ses sept \u00e9toiles les plus brillantes dont la forme \u00e9voque une casserole : les \u00e9toiles du manche sont Alka\u00efd, Mizar et Alioth, celles du r\u00e9cipient sont Megrez, Phecda, Merak et Dubhe.<\/p>\n

\"ciel7\"<\/a><\/p>\n

Pour localiser la constellation de la Grande Ourse, attendez que le ciel soit assez sombre (aux alentours de 23 h temps local) et portez votre regard en direction du nord-ouest.<\/p>\n

La constellation de la Grande Ourse (qui fait partie des 48 constellations identifi\u00e9es par l’astronome grec Claude Ptol\u00e9m\u00e9e au 2\u00e9me si\u00e8cle apr\u00e8s J.-C.) est circumpolaire depuis nos latitudes, ce qui signifie qu’elle ne se couche jamais : si vous l’observez actuellement en fin de nuit vous verrez que la rotation terrestre a entra\u00een\u00e9 la constellation au raz de l’horizon nord mais qu’elle est toujours visible.<\/p>\n

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

C’est le privil\u00e8ge des constellations situ\u00e9es \u00e0 proximit\u00e9 du p\u00f4le nord c\u00e9leste qui n’est pas tr\u00e8s loin : si vous tracez une droite imaginaire entre Merak et Dubhe et que vous la prolongez 5 fois, vous arrivez \u00e0 l’\u00e9toile polaire.<\/p>\n

\"ourse2\"<\/a><\/p>\n

Notez que la seconde \u00e9toile du manche, Mizar, est accompagn\u00e9e d’une autre \u00e9toile un peu plus faible, Alcor, que l’on peut deviner avec une bonne vue.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’\u00e9t\u00e9 est la saison id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la c\u00e9l\u00e8bre constellation de la Grande Ourse une fois la nuit tomb\u00e9e. La troisi\u00e8me plus grande constellation du ciel est celle de la Grande Ourse, souvent r\u00e9duite \u00e0 ses sept \u00e9toiles les plus brillantes dont la forme \u00e9voque une casserole : les \u00e9toiles du … Continuer la lecture de Zoom sur la Grande Ourse un soir d’\u00e9t\u00e9<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3202,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[400,456,98,1151],"class_list":["post-3201","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-circumpolaire","tag-constellation-de-la-grande-ourse","tag-etoile-polaire","tag-ptolemee"],"yoast_head":"\nZoom sur la Grande Ourse un soir d'\u00e9t\u00e9<\/title>\n<meta name=\"description\" content=\"L'\u00e9t\u00e9 est la saison id\u00e9ale pour partir \u00e0 la d\u00e9couverte de la 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