{"id":5752,"date":"2016-05-24T14:45:44","date_gmt":"2016-05-24T14:45:44","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5752"},"modified":"2016-05-31T14:27:35","modified_gmt":"2016-05-31T14:27:35","slug":"constellation-dragon-serpente-entre-deux-ourses","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/24\/constellation-dragon-serpente-entre-deux-ourses\/","title":{"rendered":"La constellation du Dragon serpente entre les deux Ourses"},"content":{"rendered":"

Par une belle soir\u00e9e de printemps on peut observer la discr\u00e8te constellation du Dragon qui se faufile entre la Grande Ourse et la Petite Ourse. \u00a0<\/strong><\/p>\n

Apr\u00e8s une douce journ\u00e9e de mai la nuit tombe et votre regard se porte en direction du p\u00f4le c\u00e9leste que marque l’\u00e9toile polaire<\/a>. Au-dessus de votre t\u00eate la Grande Ourse<\/a> attire votre attention avec ses sept \u00e9toiles brillantes ; \u00e0 l’OUEST le couple Castor et Pollux<\/a> (G\u00e9meaux) se pr\u00e9cipite dans les lueurs cr\u00e9pusculaires alors qu’\u00e0 l’EST V\u00e9ga et Deneb<\/a> annoncent l’arriv\u00e9e des constellations estivales.<\/p>\n

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

Retournons plein NORD entre la Petite Ourse et la Grande Ourse : c’est l\u00e0 que se glisse la constellation du Dragon, la huiti\u00e8me constellation la plus \u00e9tendue parmi les 88 qui peuplent le ciel.<\/p>\n

Ici pas d’\u00e9toiles spectaculaires qui attirent le regard : Gamma Draconis\u00a0<\/em>(l’\u00e9toile de la t\u00eate du Dragon qui a la plus courte distance apparente avec V\u00e9ga), la plus lumineuse, affiche une magnitude de 2,24. Si elle ne porte pas le nom de la premi\u00e8re lettre de l’alphabet grec qui devrait lui revenir de droit, c’est parce que l’appellation\u00a0Alpha Draconis<\/em> a \u00e9t\u00e9 donn\u00e9e \u00e0 un astre qui avait une grande importance pour les hommes il y a 5.000 ans : c’est elle qui indiquait alors le p\u00f4le c\u00e9leste (Alpha Draconis<\/em>\u00a0est une modeste \u00e9toile de magnitude 3,7 qui \u00a0se situe dans la queue du Dragon). En effet, l\u2019axe de rotation de la Terre variant sur une p\u00e9riode d\u2019environ 26.000 ans (un ph\u00e9nom\u00e8ne appel\u00e9 la pr\u00e9cession des \u00e9quinoxes), les \u00e9toiles situ\u00e9es dans le prolongement de cet axe ne sont pas toujours les m\u00eames.<\/p>\n

Plusieurs dragons peuplent la mythologie grecque mais la l\u00e9gende la plus r\u00e9pandue concerne le dragon Ladon. Charg\u00e9 de surveiller les pommes d’or offertes \u00e0 H\u00e9ra pour ses noces avec Zeus, pommes convoit\u00e9es par les filles du titan Atlas, le dragon fut tu\u00e9 par Hercule dont ce fut le onzi\u00e8me travail (Hercule termina ses douze travaux par une descente aux Enfers pour y encha\u00eener Cerb\u00e8re).<\/p>\n","protected":false},"excerpt":{"rendered":"

Par une belle soir\u00e9e de printemps on peut observer la discr\u00e8te constellation du Dragon qui se faufile entre la Grande Ourse et la Petite Ourse. \u00a0 Apr\u00e8s une douce journ\u00e9e de mai la nuit tombe et votre regard se porte en direction du p\u00f4le c\u00e9leste que marque l’\u00e9toile polaire. Au-dessus de votre t\u00eate la Grande … Continuer la lecture de La constellation du Dragon serpente entre les deux Ourses<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5753,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[156,456,99,1521,101,1649,1648,157,312,100],"class_list":["post-5752","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-castor","tag-constellation-de-la-grande-ourse","tag-constellation-de-la-petite-ourse","tag-constellation-du-dragon","tag-deneb","tag-douze-travaux-dhercule","tag-dragon-ladon","tag-pollux","tag-precession-des-equinoxes","tag-vega"],"yoast_head":"\nLa constellation du Dragon serpente entre les deux Ourses<\/title>\n<meta name=\"description\" content=\"Par une belle soir\u00e9e de printemps on peut observer la discr\u00e8te 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