{"id":8491,"date":"2019-04-11T01:47:28","date_gmt":"2019-04-10T23:47:28","guid":{"rendered":"http:\/\/gap47.astrosurf.com\/?page_id=8491"},"modified":"2021-04-13T01:49:58","modified_gmt":"2021-04-12T23:49:58","slug":"les-transits","status":"publish","type":"page","link":"https:\/\/gap47.astrosurf.com\/index.php\/astro-debutants\/lecons\/les-transits\/","title":{"rendered":"Les transits"},"content":{"rendered":"

Qu’est-ce qu’un Transit ?<\/span><\/strong><\/span><\/p>\n

C’est quand une plan\u00e8te int\u00e9rieure (Mercure ou V\u00e9nus) passe exactement devant le Soleil, pour nous qui sommes sur la Terre. C’est impossible pour les plan\u00e8tes ext\u00e9rieures (de Mars \u00e0 Neptune), elles ne peuvent pas passer entre nous et le Soleil. <\/span><\/p>\n

 <\/p>\n

a) Les transits de V\u00e9nus<\/strong> sont tr\u00e8s rares : en moyenne 2 par si\u00e8cle. <\/span>Les \u00e9carts r\u00e9guliers entre les transits de V\u00e9nus sont les suivants : 8 ans – 105 ans – 8 ans – 122 ans – 8 ans – 105 ans – 8 ans – 122 ans – etc. La derni\u00e8re fois c’\u00e9tait en 1882. Au XX\u00b0 si\u00e8cle, aucun. Au XXI\u00b0 si\u00e8cle c’\u00e9tait pour 2004 et 2012, mais en 2012 le transit \u00e9tait quasiment invisible depuis la France et, de surcro\u00eet, un ciel nuageux nous aurait emp\u00each\u00e9 de voir quoi que ce soit. Rendez-vous pour les prochains transits de V\u00e9nus, en 2117 et 2125 !<\/span><\/p>\n

\"\"<\/p>\n

Une photo du t\u00e9lescope orbital SDO de la Nasa, montrant le transit de V\u00e9nus en 2012 avec un Soleil photographi\u00e9 dans trois longueurs d’onde diff\u00e9rentes dans l’ultraviolet  \u2193<\/span><\/p>\n

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

 <\/p>\n

b) Les transits de Mercure<\/strong> sont moins rares (13 ou 14 par si\u00e8cle, les prochains en 2019, 2032, 2039, 2049\u2026). Ils sont moins spectaculaires que les transits de V\u00e9nus car Mercure est une plan\u00e8te beaucoup plus petite que V\u00e9nus quand elle passe devant le disque solaire.<\/span><\/p>\n

Transits de Mercure, pass\u00e9s et \u00e0 venir :<\/span><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Date<\/span><\/strong><\/td>\nTemps UTC (Gennwich)<\/span><\/strong><\/td>\n<\/tr>\n
 <\/td>\nD\u00e9but<\/span><\/strong><\/td>\nMoyen<\/span><\/strong><\/td>\nFin<\/span><\/strong><\/td>\n<\/tr>\n
14\/11\/1907<\/span><\/td>\n10:24<\/span><\/td>\n12:07<\/span><\/td>\n13:50<\/span><\/td>\n<\/tr>\n
07\/11\/1914<\/span><\/td>\n09:57<\/span><\/td>\n12:03<\/span><\/td>\n14:09<\/span><\/td>\n<\/tr>\n
08\/05\/1924<\/span><\/td>\n21:44<\/span><\/td>\n01:41<\/span><\/td>\n05:38<\/span><\/td>\n<\/tr>\n
10\/11\/1927<\/span><\/td>\n03:02<\/span><\/td>\n05:46<\/span><\/td>\n08:29<\/span><\/td>\n<\/tr>\n
11\/05\/1937<\/span><\/td>\n08:53<\/span><\/td>\n08:59<\/span><\/td>\n09:06<\/span><\/td>\n<\/tr>\n
11\/11\/1940<\/span><\/td>\n20:49<\/span><\/td>\n23:21<\/span><\/td>\n01:53<\/span><\/td>\n<\/tr>\n
14\/11\/1953<\/span><\/td>\n15:37<\/span><\/td>\n16:54<\/span><\/td>\n18:11<\/span><\/td>\n<\/tr>\n
06\/05\/1957<\/span><\/td>\n23:59<\/span><\/td>\n01:14<\/span><\/td>\n02:30<\/span><\/td>\n<\/tr>\n
07\/11\/1960<\/span><\/td>\n14:34<\/span><\/td>\n16:53<\/span><\/td>\n19:12<\/span><\/td>\n<\/tr>\n
09\/05\/1970<\/span><\/td>\n04:19<\/span><\/td>\n08:16<\/span><\/td>\n12:13<\/span><\/td>\n<\/tr>\n
10\/11\/1973<\/span><\/td>\n07:47<\/span><\/td>\n10:32<\/span><\/td>\n13:17<\/span><\/td>\n<\/tr>\n
13\/11\/1986<\/span><\/td>\n01:43<\/span><\/td>\n04:07<\/span><\/td>\n06:31<\/span><\/td>\n<\/tr>\n
06\/11\/1993<\/span><\/td>\n03:06<\/span><\/td>\n03:57<\/span><\/td>\n04:47<\/span><\/td>\n<\/tr>\n
15\/11\/1999<\/span><\/td>\n21:15<\/span><\/td>\n21:41<\/span><\/td>\n22:07<\/span><\/td>\n<\/tr>\n
07\/05\/2003<\/span><\/td>\n05:13<\/span><\/td>\n07:52<\/span><\/td>\n10:32<\/span><\/td>\n<\/tr>\n
08\/11\/2006<\/span><\/td>\n19:12<\/span><\/td>\n21:41<\/span><\/td>\n00:10<\/span><\/td>\n<\/tr>\n
09\/05\/2016<\/span><\/td>\n11:12<\/span><\/td>\n14:57<\/span><\/td>\n18:42<\/span><\/td>\n<\/tr>\n
11\/11\/2019<\/span><\/td>\n12:35<\/span><\/td>\n15:20<\/span><\/td>\n18:04<\/span><\/td>\n<\/tr>\n
13\/11\/2032<\/span><\/td>\n06:41<\/span><\/td>\n08:54<\/span><\/td>\n11:07<\/span><\/td>\n<\/tr>\n
07\/11\/2039<\/span><\/td>\n07:17<\/span><\/td>\n08:46<\/span><\/td>\n10:15<\/span><\/td>\n<\/tr>\n
07\/05\/2049<\/span><\/td>\n11:03<\/span><\/td>\n14:24<\/span><\/td>\n17:44<\/span><\/td>\n<\/tr>\n
09\/11\/2052<\/span><\/td>\n23:53<\/span><\/td>\n02:29<\/span><\/td>\n05:06<\/span><\/td>\n<\/tr>\n
10\/05\/2062<\/span><\/td>\n18:16<\/span><\/td>\n21:36<\/span><\/td>\n00:57<\/span><\/td>\n<\/tr>\n
11\/11\/2065<\/span><\/td>\n17:24<\/span><\/td>\n20:06<\/span><\/td>\n22:48<\/span><\/td>\n<\/tr>\n
14\/11\/2078<\/span><\/td>\n11:42<\/span><\/td>\n13:41<\/span><\/td>\n15:39<\/span><\/td>\n<\/tr>\n
07\/11\/2085<\/span><\/td>\n11:42<\/span><\/td>\n13:34<\/span><\/td>\n15:26<\/span><\/td>\n<\/tr>\n
08\/05\/2095<\/span><\/td>\n17:20<\/span><\/td>\n21:05<\/span><\/td>\n00:50<\/span><\/td>\n<\/tr>\n
10\/11\/2098<\/span><\/td>\n04:35<\/span><\/td>\n07:16<\/span><\/td>\n09:57<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Photo (non prise par le GAP47) d’un transit de Mercure  \u2193<\/span><\/em><\/span><\/p>\n

\"\"<\/a><\/strong><\/span><\/p>\n

c) Les doubles transits simultan\u00e9s de V\u00e9nus et de Mercure<\/strong> : ils sont rarissimes : le prochain sera le 26 juillet 69.163 et le suivant en 224.508 !<\/span><\/p>\n

Pour voir des photos faites par les membres du GAP47 du transit de V\u00e9nus le 8 juin 2004, cliquez !<\/span><\/strong><\/a><\/p>\n

\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Qu’est-ce qu’un Transit ? C’est quand une plan\u00e8te int\u00e9rieure (Mercure ou V\u00e9nus) passe exactement devant le Soleil, pour nous qui sommes sur la Terre. C’est impossible pour les plan\u00e8tes ext\u00e9rieures (de Mars \u00e0 Neptune), elles ne peuvent pas passer entre nous et le Soleil.    a) Les transits de V\u00e9nus sont tr\u00e8s rares : en … <\/p>\n

Continuer la lecture de « Les transits »<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":168,"menu_order":8,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-8491","page","type-page","status-publish","hentry"],"yoast_head":"\nLes transits - L'observatoire est ouvert aux visiteurs tous les vendredis soirs \u00e0 21 heures, jusqu'au 3 juillet 2026 inclus, sans r\u00e9servation.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gap47.astrosurf.com\/index.php\/astro-debutants\/lecons\/les-transits\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les transits - L'observatoire est ouvert aux visiteurs tous les vendredis soirs \u00e0 21 heures, jusqu'au 3 juillet 2026 inclus, sans r\u00e9servation.\" \/>\n<meta property=\"og:description\" content=\"Qu’est-ce qu’un Transit ? C’est quand une plan\u00e8te int\u00e9rieure (Mercure ou V\u00e9nus) passe exactement devant le Soleil, pour nous qui sommes sur la Terre. 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