{"id":11109,"date":"2019-09-05T04:16:31","date_gmt":"2019-09-05T04:16:31","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11109"},"modified":"2019-09-20T18:55:06","modified_gmt":"2019-09-20T18:55:06","slug":"le-ciel-etoile-a-tourne-autour-dun-pommier","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/05\/le-ciel-etoile-a-tourne-autour-dun-pommier\/","title":{"rendered":"Le ciel \u00e9toil\u00e9 a tourn\u00e9 autour d’un pommier"},"content":{"rendered":"

Un pommier sous les \u00e9toiles, \u00e7a vous dit ? La nouvelle image que je vous pr\u00e9sente fait partie de la s\u00e9rie consacr\u00e9e aux rotations d’\u00e9toiles.<\/strong><\/p>\n

Comme un go\u00fbt de pomme :<\/h5>\n

Savez-vous que le pommier se d\u00e9cline en une quarantaine d’esp\u00e8ces et plus de 20.000 vari\u00e9t\u00e9s ? Cet arbre fruitier est un incontournable des jardins. Il r\u00e9siste aux grands froids et peut se planter un peu partout. Selon les vari\u00e9t\u00e9s la r\u00e9colte s’\u00e9tire de juillet \u00e0 octobre. Celui que j’ai choisi a encore quelques jours de maturit\u00e9 \u00e0 gagner avant que les gourmands ne viennent le d\u00e9pouiller.<\/p>\n

\"\"<\/a>
Le pommier sous les \u00e9toiles. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Orn\u00e9 de ses fruits, il \u00e9tait bien orient\u00e9 pour loger l’\u00e9toile polaire<\/a> \u00e0 son sommet et l’immortaliser pendant la nuit.\u00a0 <\/p>\n

Un peu de technique :<\/h5>\n

Vous avez envie d\u2019immortaliser une rotation d\u2019\u00e9toiles au-dessus d\u2019un joli premier plan ? C\u2019est possible en suivant les quelques conseils qui suivent. Commen\u00e7ons par une petite explication : ce qu\u2019on appelle une rotation d\u2019\u00e9toiles est en r\u00e9alit\u00e9 la visualisation du mouvement de rotation de la Terre sur elle-m\u00eame. Vous l\u2019avez remarqu\u00e9, les astres effectuent dans le ciel un mouvement apparent d\u2019EST en OUEST en raison du mouvement r\u00e9el de notre plan\u00e8te sur elle-m\u00eame. La technique pour enregistrer ce mouvement apparent des astres autour de l\u2019\u00e9toile polaire est assez simple : on prend un maximum de clich\u00e9s de cette zone du ciel qu\u2019on additionne ensuite \u00e0 l\u2019aide d\u2019un logiciel. Pour ma part j’utilise l’excellent StarMax<\/a>.<\/p>\n

Ce clich\u00e9 est une addition de 200 prises de 45 secondes chacune \u00e0 800 iso. Bo\u00eetier Nikon D3200, objectif Samyang de 12 mm de focale ouvert \u00e0 2,8.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un pommier sous les \u00e9toiles, \u00e7a vous dit ? La nouvelle image que je vous pr\u00e9sente fait partie de la s\u00e9rie consacr\u00e9e aux rotations d’\u00e9toiles. Comme un go\u00fbt de pomme : Savez-vous que le pommier se d\u00e9cline en une quarantaine d’esp\u00e8ces et plus de 20.000 vari\u00e9t\u00e9s ? Cet arbre fruitier est un incontournable des jardins. … Continuer la lecture de Le ciel \u00e9toil\u00e9 a tourn\u00e9 autour d’un pommier<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11110,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[98,2706,1197],"class_list":["post-11109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-etoile-polaire","tag-pommier","tag-rotation-detoiles"],"yoast_head":"\nLe ciel \u00e9toil\u00e9 a tourn\u00e9 autour d'un pommier<\/title>\n<meta name=\"description\" content=\"Un pommier sous les \u00e9toiles, \u00e7a vous dit ? 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