{"id":6351,"date":"2016-09-21T15:48:28","date_gmt":"2016-09-21T15:48:28","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6351"},"modified":"2017-09-25T16:49:27","modified_gmt":"2017-09-25T16:49:27","slug":"changement-de-saison-22-septembre-jour-de-lequinoxe","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/21\/changement-de-saison-22-septembre-jour-de-lequinoxe\/","title":{"rendered":"Changement de saison le 22 septembre, jour de l&#8217;\u00e9quinoxe"},"content":{"rendered":"<p><strong>C\u2019est le 22 septembre que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. Il s\u2019agit de l\u2019\u00e9quinoxe, moment o\u00f9 le Soleil traverse le plan \u00e9quatorial terrestre. \u00a0<\/strong><\/p>\n<p>L&#8217;\u00e9quinoxe du 22 septembre annonce un changement de saison qui n\u2019a rien d\u2019arbitraire ; il est dict\u00e9 par le mouvement apparent du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/15\/dans-la-mer-le-soleil-est-encore-plus-beau\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>. Au cours de l\u2019\u00e9quinoxe notre \u00e9toile coupe l\u2019\u00e9quateur c\u00e9leste (qui n\u2019est que la projection sur la vo\u00fbte c\u00e9leste de notre \u00e9quateur terrestre). Le franchissement de l\u2019\u00e9quateur c\u00e9leste par le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/11\/un-avion-de-ligne-passe-devant-le-soleil-tache\/\" target=\"_blank\" rel=\"noopener\">Soleil <\/a>s\u2019effectue dans le sens nord-sud et se fera dans le sens inverse le 20 mars 2018, date de l\u2019\u00e9quinoxe de printemps.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe.jpg\" rel=\"lightbox[6351]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6352\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe-450x295.jpg\" alt=\"equinoxe\" width=\"450\" height=\"295\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe-450x295.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe-768x504.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe-1024x672.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/09\/equinoxe.jpg 1372w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>D\u00e9sormais le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/04\/en-video-la-station-spatiale-passe-devant-le-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil <\/a>(que l&#8217;on voit ici se lever presque dans l&#8217;axe du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/25\/croissant-lhorizon\/\" target=\"_blank\" rel=\"noopener\">beffroi de Nuits-Saint-Georges<\/a> en C\u00f4te-d&#8217;Or)\u00a0va traverser le ciel au sud de\u00a0l\u2019\u00e9quateur c\u00e9leste : c\u2019est le d\u00e9but de l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord, du printemps dans l\u2019h\u00e9misph\u00e8re sud.<!--more--><\/p>\n<p>Le Soleil atteindra sa d\u00e9clinaison la plus basse le 21 d\u00e9cembre prochain : ce sera le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/21\/solstice-de-decembre\/\" target=\"_blank\" rel=\"noopener\">solstice <\/a>qui marquera le d\u00e9but de l\u2019hiver dans l\u2019h\u00e9misph\u00e8re nord.<\/p>\n<p><span id=\"more-3695\"><\/span>Ce 22 septembre, comme le 20 mars prochain, la dur\u00e9e du jour sera \u00e9gale \u00e0 la dur\u00e9e de la nuit, une \u00e9galit\u00e9 \u00e0 l\u2019origine du mot \u00e9quinoxe, du latin\u00a0\u00a0<em>\u00e6quus<\/em> (\u00e9gal) et <em>nox, noctis<\/em> (nuit). Les nuits vont donc continuer de s\u2019allonger, faisant le bonheur des\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\" rel=\"noopener\">astronomes <\/a>qui pourront passer plus de temps \u00e0 contempler les merveilles du ciel nocturne, tels des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/19\/en-video-scintillaris-lhistoire-dun-cueilleur-detoiles\/\" target=\"_blank\" rel=\"noopener\">cueilleurs d\u2019\u00e9toiles<\/a>.<\/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>C\u2019est le 22 septembre que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. Il s\u2019agit de l\u2019\u00e9quinoxe, moment o\u00f9 le Soleil traverse le plan \u00e9quatorial terrestre. \u00a0 L&#8217;\u00e9quinoxe du 22 septembre annonce un changement de saison qui n\u2019a rien d\u2019arbitraire ; il est dict\u00e9 par le mouvement apparent du Soleil. Au cours de l\u2019\u00e9quinoxe notre \u00e9toile coupe l\u2019\u00e9quateur &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/21\/changement-de-saison-22-septembre-jour-de-lequinoxe\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Changement de saison le 22 septembre, jour de l&#8217;\u00e9quinoxe<\/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":6352,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[418,1254,378,97,216],"class_list":["post-6351","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-automne","tag-equateur-celeste","tag-equinoxe","tag-soleil","tag-solstice"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Changement de saison le 22 septembre, jour de l&#039;\u00e9quinoxe<\/title>\n<meta name=\"description\" content=\"C\u2019est le 22 septembre que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. 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