{"id":83568,"date":"2025-03-22T13:21:42","date_gmt":"2025-03-22T13:21:42","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/20-mars-2025-cest-le-printemps"},"modified":"2025-03-22T13:21:42","modified_gmt":"2025-03-22T13:21:42","slug":"20-mars-2025-cest-le-printemps","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/20-mars-2025-cest-le-printemps","title":{"rendered":"20 mars 2025, c&rsquo;est le printemps !"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>La date du 21 mars a longtemps e\u0301te\u0301 associe\u0301e au de\u0301but du printemps, notamment parce qu\u2019au 20e sie\u0300cle cette date a e\u0301te\u0301 celle de l\u2019e\u0301quinoxe a\u0300 57 reprises. Mais ce n\u2019est plus le cas depuis 2011 et ne le sera plus avant 2102. De\u0301sormais, l\u2019e\u0301quinoxe de printemps survient presque syste\u0301matiquement le 20 mars, et dans certaines anne\u0301es futures il pourra me\u0302me tomber un 19 mars. Cette tendance est due aux subtilite\u0301s du calendrier gre\u0301gorien et aux ajustements lie\u0301s aux anne\u0301es bissextiles.<\/p>\n<p><b>Un phe\u0301nome\u0300ne astronomique<\/b><\/p>\n<p>En 2025, le printemps pointera officiellement son nez le 20 mars a\u0300 10h01 (heure de Paris), selon l\u2019Institut de me\u0301canique ce\u0301leste et de calcul des e\u0301phe\u0301me\u0301rides (IMCCE). Cet instant correspond a\u0300 l\u2019e\u0301quinoxe de printemps, c\u2019est-a\u0300-dire le moment ou\u0300 l\u2019inclinaison de l\u2019axe terrestre par rapport au Soleil est nulle. Ce phe\u0301nome\u0300ne, qui se produit deux fois par an (au printemps et a\u0300 l&rsquo;automne), marque un e\u0301quilibre parfait entre la dure\u0301e du jour et de la nuit. Ce jour-la\u0300, le Soleil se le\u0300ve presque exactement a\u0300 l\u2019est et se couche presque plein ouest.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"339\" class=\"alignnone wp-image-83566 size-full\" src=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2025\/03\/sm_1742637258.121752.jpg\" srcset=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2025\/03\/sm_1742637258.121752.jpg 453w, https:\/\/static.africa-press.net\/tchad\/sites\/41\/2025\/03\/sm_1742637258.121752-300x225.jpg 300w, https:\/\/static.africa-press.net\/tchad\/sites\/41\/2025\/03\/sm_1742637258.121752-80x60.jpg 80w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Un printemps pre\u0301coce a\u0300 cause d&rsquo;une anne\u0301e bissextile<\/b><\/p>\n<p>Le de\u0301calage progressif de la date de l\u2019e\u0301quinoxe s\u2019explique par le fait que l\u2019anne\u0301e terrestre ne dure pas exactement 365 jours, mais environ 365,2422 jours. Pour compenser ce de\u0301calage, les astronomes (et surtout Jules Ce\u0301sar !) ont rajoute\u0301 un jour intercalaire tous les quatre ans (il y a des exceptions): le 29 fe\u0301vrier, les anne\u0301es bissextiles. Ainsi, l\u2019anne\u0301e 2000 ayant e\u0301te\u0301 bissextile, elle a entrai\u0302ne\u0301 un recul moyen de trois-quarts de jour de l\u2019e\u0301quinoxe pour toutes les anne\u0301es suivantes du 21e sie\u0300cle.<\/p>\n<p>En 2100, cependant, il n\u2019y aura pas de 29 fe\u0301vrier, ce qui retardera le\u0301ge\u0300rement l\u2019e\u0301quinoxe. C\u2019est ainsi que, pour la premie\u0300re fois depuis pre\u0300s d\u2019un sie\u0300cle, le printemps tombera de nouveau un 21 mars en 2102. Pour ceux qui souhaitent connai\u0302tre les dates pre\u0301cises des saisons passe\u0301es et futures, l\u2019IMCCE propose un calendrier couvrant la pe\u0301riode de 1583 a\u0300 2999 !<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Tchad<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. La date du 21 mars a longtemps e\u0301te\u0301 associe\u0301e au de\u0301but du printemps, notamment parce qu\u2019au 20e sie\u0300cle cette date a e\u0301te\u0301 celle de l\u2019e\u0301quinoxe a\u0300 57 reprises. Mais ce n\u2019est plus le cas depuis 2011 et ne le sera plus avant 2102. De\u0301sormais, l\u2019e\u0301quinoxe de printemps survient presque syste\u0301matiquement le 20 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":83567,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-83568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-tchad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>20 mars 2025, c&#039;est le printemps ! - tchad<\/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:\/\/www.africa-press.net\/tchad\/politique\/20-mars-2025-cest-le-printemps\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"20 mars 2025, c&#039;est le printemps !\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Tchad. La date du 21 mars a longtemps e\u0301te\u0301 associe\u0301e au de\u0301but du printemps, notamment parce qu\u2019au 20e sie\u0300cle cette date a e\u0301te\u0301 celle de l\u2019e\u0301quinoxe a\u0300 57 reprises. Mais ce n\u2019est plus le cas depuis 2011 et ne le sera plus avant 2102. 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La date du 21 mars a longtemps e\u0301te\u0301 associe\u0301e au de\u0301but du printemps, notamment parce qu\u2019au 20e sie\u0300cle cette date a e\u0301te\u0301 celle de l\u2019e\u0301quinoxe a\u0300 57 reprises. Mais ce n\u2019est plus le cas depuis 2011 et ne le sera plus avant 2102. 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