{"id":3695,"date":"2015-09-23T04:52:13","date_gmt":"2015-09-23T04:52:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3695"},"modified":"2015-10-01T04:56:08","modified_gmt":"2015-10-01T04:56:08","slug":"le-23-septembre-cest-le-jour-de-lequinoxe","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/23\/le-23-septembre-cest-le-jour-de-lequinoxe\/","title":{"rendered":"Le 23 septembre c&#8217;est le jour de l&#8217;\u00e9quinoxe"},"content":{"rendered":"<p><strong>C&#8217;est aujourd&#8217;hui que d\u00e9bute l&#8217;automne dans l&#8217;h\u00e9misph\u00e8re nord. Il s&#8217;agit de l&#8217;\u00e9quinoxe, moment o\u00f9 le Soleil traverse le plan \u00e9quatorial terrestre. \u00a0<\/strong><\/p>\n<p>Le changement de saison n&#8217;a rien d&#8217;arbitraire ; 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\">Soleil<\/a>. Au cours de l&#8217;\u00e9quinoxe notre \u00e9toile coupe l&#8217;\u00e9quateur c\u00e9leste (qui n&#8217;est que la projection sur la vo\u00fbte c\u00e9leste de notre \u00e9quateur terrestre). Le franchissement de l&#8217;\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\">Soleil <\/a>s&#8217;effectue dans le sens nord-sud aujourd&#8217;hui et se fera dans le sens sud-nord le 20 mars 2016, date de l&#8217;\u00e9quinoxe de printemps.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/soleil3.jpg\" rel=\"lightbox[3695]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3696\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/soleil3-450x338.jpg\" alt=\"soleil3\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/soleil3-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/soleil3-1024x770.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/09\/soleil3.jpg 1200w\" 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\">Soleil <\/a>va traverser le ciel au sud de\u00a0l&#8217;\u00e9quateur c\u00e9leste : c&#8217;est le d\u00e9but de l&#8217;automne dans l&#8217;h\u00e9misph\u00e8re nord, du printemps dans l&#8217;h\u00e9misph\u00e8re sud. Le Soleil atteindra sa d\u00e9clinaison la plus basse le 22 d\u00e9cembre prochain : ce sera le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/21\/solstice-de-decembre\/\" target=\"_blank\">solstice <\/a>qui marquera le d\u00e9but de l&#8217;hiver dans l&#8217;h\u00e9misph\u00e8re nord.<\/p>\n<p><!--more-->Ce 23 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&#8217;origine du mot \u00e9quinoxe, du latin\u00a0\u00a0<em>\u00e6quus<\/em> (\u00e9gal) et <em>nox, noctis<\/em> (nuit).<\/p>\n<p>Les nuits vont donc continuer de s&#8217;allonger, faisant le bonheur des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">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\">cueilleurs d&#8217;\u00e9toiles<\/a>. Ils ont d\u00e9j\u00e0 coch\u00e9 sur leurs agenda le 28 septembre, date de la prochaine <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/05\/4-avril-leclipse-totale-de-lune-que-leurope-na-pas-vue\/\" target=\"_blank\">\u00e9clipse de Lune<\/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&#8217;est aujourd&#8217;hui que d\u00e9bute l&#8217;automne dans l&#8217;h\u00e9misph\u00e8re nord. Il s&#8217;agit de l&#8217;\u00e9quinoxe, moment o\u00f9 le Soleil traverse le plan \u00e9quatorial terrestre. \u00a0 Le changement de saison n&#8217;a rien d&#8217;arbitraire ; il est dict\u00e9 par le mouvement apparent du Soleil. Au cours de l&#8217;\u00e9quinoxe notre \u00e9toile coupe l&#8217;\u00e9quateur c\u00e9leste (qui n&#8217;est que la projection sur la &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/23\/le-23-septembre-cest-le-jour-de-lequinoxe\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Le 23 septembre c&#8217;est le 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":3696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1254,378,217,97,216],"class_list":["post-3695","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-equateur-celeste","tag-equinoxe","tag-hemisphere","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>Le 23 septembre c&#039;est le jour de l&#039;\u00e9quinoxe<\/title>\n<meta name=\"description\" content=\"C&#039;est aujourd&#039;hui que d\u00e9bute l&#039;automne dans l&#039;h\u00e9misph\u00e8re nord. 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