{"id":98266,"date":"2026-01-02T15:17:19","date_gmt":"2026-01-02T15:17:19","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/perihelie-de-la-terre-signification-et-implications"},"modified":"2026-01-02T15:47:33","modified_gmt":"2026-01-02T15:47:33","slug":"perihelie-de-la-terre-signification-et-implications","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/perihelie-de-la-terre-signification-et-implications","title":{"rendered":"Pe\u0301rihe\u0301lie de la Terre: Signification et Implications"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>La Terre passera au plus pre\u0300s du Soleil le samedi 3 janvier 2026. A 17h15 minutes et 38 secondes UTC (18h15, heure de Paris), la distance entre le centre de notre plane\u0300te et celui du Soleil atteindra son minimum annuel, a\u0300 147.099.894,004 kilome\u0300tres. Un rapprochement d\u2019environ 5 millions de kilome\u0300tres par rapport a\u0300 l\u2019aphe\u0301lie, pre\u0301vu de\u0301but juillet. Une e\u0301valuation faite par le LTE, le nouveau Laboratoire Temps Espace, issu de la fusion en 2025 de l&rsquo;Institut de me\u0301canique ce\u0301leste et de calcul des e\u0301phe\u0301me\u0301rides (IMCCE) et du SYRTE (Syste\u0300mes de Re\u0301fe\u0301rence Temps-Espace) de l&rsquo;Observatoire de Paris.<\/p>\n<p><b>Une orbite elliptique sans effet notable sur les saisons<\/b><\/p>\n<p>La variation de distance entre la Terre et le Soleil est une conse\u0301quence directe de la forme le\u0301ge\u0300rement elliptique de l\u2019orbite terrestre. Contrairement a\u0300 une ide\u0301e tenace, ce rapprochement n\u2019explique pas les saisons. Celles-ci de\u0301pendent avant tout de l\u2019inclinaison de l\u2019axe de rotation de la Terre, d\u2019environ 23,4 degre\u0301s, et de la position de la plane\u0300te sur son orbite. Lorsque l\u2019he\u0301misphe\u0300re nord est incline\u0301 vers le Soleil, l\u2019ensoleillement y est maximal et c\u2019est l\u2019e\u0301te\u0301. Le solstice d\u2019e\u0301te\u0301 correspond au moment ou\u0300 la longitude apparente du Soleil atteint 90 degre\u0301s. En 2026, il aura lieu le 21 juin.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"277\" class=\"alignnone wp-image-98264 size-full\" src=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2026\/01\/sm_1767356156.617197.jpg\" srcset=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2026\/01\/sm_1767356156.617197.jpg 453w, https:\/\/static.africa-press.net\/tchad\/sites\/41\/2026\/01\/sm_1767356156.617197-300x183.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Des dates qui glissent lentement dans le calendrier<\/b><\/p>\n<p>Les dates de passage au pe\u0301rihe\u0301lie et a\u0300 l\u2019aphe\u0301lie ne sont pas fixes. Elles avancent d\u2019environ 20 minutes par an dans le calendrier sous l\u2019effet des perturbations gravitationnelles exerce\u0301es par les autres plane\u0300tes du syste\u0300me solaire. Ce glissement, imperceptible a\u0300 l\u2019e\u0301chelle humaine, devient significatif sur des mille\u0301naires. Les calculs montrent qu\u2019aux alentours de l\u2019an 6430, le pe\u0301rihe\u0301lie coi\u0308ncidera avec l\u2019e\u0301quinoxe de printemps. Et dans un peu moins de 10.000 ans, il tombera au moment du solstice d\u2019e\u0301te\u0301.<\/p>\n<p>Ces e\u0301volutions s\u2019inscrivent dans un cadre plus large, celui des cycles de Milankovic\u0301. Ces variations lentes de l\u2019excentricite\u0301 de l\u2019orbite terrestre, de l\u2019inclinaison de l\u2019axe et de la pre\u0301cession modulent la re\u0301partition de l\u2019e\u0301nergie solaire rec\u0327ue par la Terre sur des dizaines de milliers d\u2019anne\u0301es. Elles jouent un ro\u0302le majeur dans les grandes oscillations climatiques du passe\u0301, notamment l\u2019alternance des pe\u0301riodes glaciaires et interglaciaires. Si le pe\u0301rihe\u0301lie de janvier n\u2019a donc aucune incidence sur la rigueur de l\u2019hiver, il participe, a\u0300 tre\u0300s long terme, a\u0300 la me\u0301canique fine du climat terrestre.<\/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><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. La Terre passera au plus pre\u0300s du Soleil le samedi 3 janvier 2026. A 17h15 minutes et 38 secondes UTC (18h15, heure de Paris), la distance entre le centre de notre plane\u0300te et celui du Soleil atteindra son minimum annuel, a\u0300 147.099.894,004 kilome\u0300tres. Un rapprochement d\u2019environ 5 millions de kilome\u0300tres par rapport [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":98265,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-98266","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>Pe\u0301rihe\u0301lie de la Terre: Signification et Implications - tchad<\/title>\n<meta name=\"description\" content=\"La Terre passera au plus pre\u0300s du Soleil le samedi 3 janvier 2026. 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