{"id":18451,"date":"2023-09-20T16:01:37","date_gmt":"2023-09-20T16:01:37","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18451"},"modified":"2023-10-03T16:49:28","modified_gmt":"2023-10-03T16:49:28","slug":"samedi-23-septembre-cest-lequinoxe-dautomne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/20\/samedi-23-septembre-cest-lequinoxe-dautomne\/","title":{"rendered":"Samedi 23 septembre, c&#8217;est l&#8217;\u00e9quinoxe d&#8217;automne"},"content":{"rendered":"<p><strong>C\u2019est le samedi 23 septembre, jour de l&#8217;\u00e9quinoxe, que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. Explications.<\/strong><\/p>\n<h5>M\u00e9canique c\u00e9leste :<\/h5>\n<p>Le changement de saison n\u2019a rien d\u2019arbitraire, il est dict\u00e9 par la conjonction de deux facteurs : la course annuelle de la Terre autour du <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/astronomie-soleil-notre-etoile-va-t-elle-mourir-9545\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a> et l&#8217;inclinaison de l&#8217;axe de rotation de notre plan\u00e8te.<\/p>\n<ul>\n<li>L\u2019\u00e9quinoxe vu de l&#8217;espace : c&#8217;est le point de l&#8217;orbite terrestre o\u00f9 les rayons du Soleil atteignent simultan\u00e9ment les deux p\u00f4les :<\/li>\n<\/ul>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/equinoxe.jpg\" rel=\"lightbox[18451]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18456\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/equinoxe-450x339.jpg\" alt=\"\" width=\"450\" height=\"339\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/equinoxe-450x339.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/equinoxe-768x579.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/equinoxe.jpg 1021w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<ul>\n<li>L&#8217;\u00e9quinoxe vu de la Terre : c&#8217;est le moment o\u00f9 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 Soleil s\u2019effectue dans le sens Nord-Sud le 23 septembre 2023 et se fera dans le sens Sud-Nord le 20 mars 2024, date de l\u2019\u00e9quinoxe de printemps :<\/li>\n<\/ul>\n<figure id=\"attachment_15836\" aria-describedby=\"caption-attachment-15836\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires.jpg\" rel=\"lightbox[18451]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15836\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15836\" class=\"wp-caption-text\">Lors de l&#8217;\u00e9quinoxe, le Soleil coupe l&#8217;\u00e9quateur c\u00e9leste. \u00a9<a href=\"https:\/\/www.instagram.com\/marek.nikodem.niki\/\" target=\"_blank\" rel=\"noopener\"> Marek Nikodem<\/a><\/figcaption><\/figure>\n<p>D\u00e9sormais le Soleil (qui se trouve depuis quelques jours dans la\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/20\/des-milliers-de-galaxies-se-cachent-dans-la-vierge\/\" target=\"_blank\" rel=\"noopener\">constellation de la Vierge<\/a>) va traverser le ciel au sud de l\u2019\u00e9quateur c\u00e9leste. Ce passage marque le d\u00e9but de l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord, du printemps dans l\u2019h\u00e9misph\u00e8re sud. <!--more--><\/p>\n<h5>Nuits pour astronomes :<\/h5>\n<p>Ce 23 septembre, comme le 20 mars prochain, la dur\u00e9e du jour est \u00e9gale \u00e0 la dur\u00e9e de la nuit. Cette \u00e9galit\u00e9 est \u00e0 l\u2019origine du mot \u00e9quinoxe, du latin <em>\u00e6quus<\/em>\u00a0(\u00e9gal) et\u00a0<em>nox<\/em>,\u00a0<em>noctis<\/em> (nuit). Les nuits vont donc continuer de s\u2019allonger jusqu&#8217;au 22 d\u00e9cembre, date \u00e0 laquelle le Soleil atteindra sa d\u00e9clinaison la plus basse. Ce sera alors le d\u00e9but de l\u2019hiver dans l\u2019h\u00e9misph\u00e8re nord :<\/p>\n<figure id=\"attachment_17232\" aria-describedby=\"caption-attachment-17232\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope.jpg\" rel=\"lightbox[18451]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-17232\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/telescope.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-17232\" class=\"wp-caption-text\">Les nuits s&#8217;allongent pour le plus grand plaisir des astronomes. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Les amoureux des \u00e9toiles appr\u00e9cient ces nuits de plus en plus longues. Ils peuvent passer ainsi plus de temps \u00e0 contempler les merveilles du ciel nocturne, comme par exemple la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/07\/voie-lactee-depuis-la-station-savoyarde-du-corbier\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a>, la belle <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/23\/en-images-la-majestueuse-constellation-dorion\/\" target=\"_blank\" rel=\"noopener\">constellation d&#8217;Orion<\/a> ou encore la plan\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/08\/24\/admirez-saturne-au-plus-pres-de-la-terre-ce-weekend\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/06\/astrophoto-le-systeme-solaire-selon-tom-williams\/\" target=\"_blank\" rel=\"noopener\">Astrophoto : le Syst\u00e8me solaire selon Tom Williams<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/11\/peut-on-choisir-son-premier-telescope-sans-se-tromper\/\" target=\"_blank\" rel=\"noopener\">Peut-on choisir son premier t\u00e9lescope sans se tromper ?<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/08\/19\/on-peut-photographier-les-planetes-avec-un-petit-telescope\/\" target=\"_blank\" rel=\"noopener\">Comment photographier les plan\u00e8tes avec un petit t\u00e9lescope<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/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 samedi 23 septembre, jour de l&#8217;\u00e9quinoxe, que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. Explications. M\u00e9canique c\u00e9leste : Le changement de saison n\u2019a rien d\u2019arbitraire, il est dict\u00e9 par la conjonction de deux facteurs : la course annuelle de la Terre autour du Soleil et l&#8217;inclinaison de l&#8217;axe de rotation de notre plan\u00e8te. L\u2019\u00e9quinoxe vu &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/20\/samedi-23-septembre-cest-lequinoxe-dautomne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Samedi 23 septembre, c&#8217;est l&#8217;\u00e9quinoxe d&#8217;automne<\/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":15836,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2306,97],"class_list":["post-18451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-equinoxe-dautomne","tag-soleil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Samedi 23 septembre, c&#039;est l&#039;\u00e9quinoxe d&#039;automne<\/title>\n<meta name=\"description\" content=\"C\u2019est le samedi 23 septembre, jour de l&#039;\u00e9quinoxe, que d\u00e9bute l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord. 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