{"id":935,"date":"2026-09-22T19:33:23","date_gmt":"2026-09-22T17:33:23","guid":{"rendered":"https:\/\/astrocastor.cat\/?p=935"},"modified":"2026-10-12T18:29:49","modified_gmt":"2026-10-12T16:29:49","slug":"lequinocci-de-tardor-2026","status":"publish","type":"post","link":"https:\/\/astrocastor.cat\/index.php\/2026\/09\/22\/lequinocci-de-tardor-2026\/","title":{"rendered":"L\u2019equinocci de tardor 2026"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-large-font-size\">El moment que marca l\u2019inici de la tardor astron\u00f2mica<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">El <strong>23 de setembre de 2026, a les 02:05 h (hora oficial peninsular)<\/strong>, tindr\u00e0 lloc l\u2019equinocci de tardor, l\u2019instant que marca l\u2019inici de la tardor astron\u00f2mica a l\u2019hemisferi nord.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019equinocci \u00e9s un moment concret dins del moviment de la Terra al voltant del Sol. En aquest instant, el centre del Sol travessa l\u2019<strong>equador celeste<\/strong> en el seu moviment aparent cap al sud. Al mateix temps, a l\u2019hemisferi sud comen\u00e7ar\u00e0 la primavera.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La tardor astron\u00f2mica de 2026 tindr\u00e0 una durada aproximada de <strong>89 dies i 21 hores<\/strong>, fins al 21 de desembre, quan arribar\u00e0 el solstici d\u2019hivern.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"930\" src=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Equinocci.webp\" alt=\"\" class=\"wp-image-936\" srcset=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Equinocci.webp 1024w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Equinocci-300x272.webp 300w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Equinocci-767x697.webp 767w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u00e8 \u00e9s exactament un equinocci?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La paraula <em>equinocci<\/em> prov\u00e9 del llat\u00ed <em>aequinoctium<\/em>, relacionat amb <em>aequus<\/em> (\u00abigual\u00bb) i <em>nox<\/em> (\u00abnit\u00bb), en refer\u00e8ncia a la durada aproximadament igual del dia i la nit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Durant els equinoccis, el centre del Sol creua l\u2019equador celeste. En el cas de l\u2019equinocci de tardor, ho fa en direcci\u00f3 cap a la part sud del cel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A causa d\u2019aquest fenomen, al voltant de l\u2019equinocci la durada del dia i de la nit \u00e9s molt semblant. Tanmateix, <strong>no s\u00f3n exactament 12 hores de dia i 12 hores de nit<\/strong>. La refracci\u00f3 de l\u2019atmosfera i el fet que el Sol sigui un disc amb una mida aparent apreciable fan que la durada del dia sigui lleugerament superior a les 12 hores en molts indrets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Per qu\u00e8 tenim estacions?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les estacions de l\u2019any es produeixen principalment per la <strong>inclinaci\u00f3 de l\u2019eix de rotaci\u00f3 de la Terra<\/strong>, d\u2019uns 23,5\u00b0 respecte del pla de la seva \u00f2rbita al voltant del Sol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A mesura que la Terra recorre la seva \u00f2rbita, aquesta inclinaci\u00f3 fa que vari\u00ef la manera com la radiaci\u00f3 solar incideix sobre cada hemisferi. Durant l\u2019estiu boreal, l\u2019hemisferi nord rep m\u00e9s hores de llum i la radiaci\u00f3 solar hi arriba amb una major elevaci\u00f3 sobre l\u2019horitz\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Amb el pas dels mesos, aquesta situaci\u00f3 canvia progressivament fins arribar a l\u2019equinocci de tardor.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"791\" height=\"1024\" src=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Estaciones-791x1024.png\" alt=\"\" class=\"wp-image-939\" srcset=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Estaciones-791x1024.png 791w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Estaciones-232x300.png 232w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Estaciones-767x993.png 767w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/Estaciones.png 912w\" sizes=\"auto, (max-width: 791px) 100vw, 791px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">El cel durant la tardor de 2026<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019arribada de la tardor tamb\u00e9 comporta canvis progressius en el cel nocturn. Les nits cada vegada m\u00e9s llargues ofereixen m\u00e9s hores d\u2019observaci\u00f3 i permeten que les constel\u00b7lacions pr\u00f2pies de la tardor vagin guanyant protagonisme.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A comen\u00e7aments de la tardor de 2026, despr\u00e9s de la posta de Sol, podrem observar <strong>Mercuri i Venus<\/strong>, mentre que <strong>Saturn<\/strong> apareixer\u00e0 uns dies m\u00e9s tard. Mercuri i Venus es podran observar, respectivament, fins a mitjans i finals d\u2019octubre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per als aficionats a l\u2019observaci\u00f3 del cel profund, l\u2019allargament progressiu de les nits tamb\u00e9 significa m\u00e9s temps disponible per observar i fotografiar nebuloses, gal\u00e0xies i c\u00famuls estel\u00b7lars.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-1024x683.jpg\" alt=\"\" class=\"wp-image-940\" srcset=\"https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-1024x683.jpg 1024w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-300x200.jpg 300w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-768x512.jpg 768w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-1536x1024.jpg 1536w, https:\/\/astrocastor.cat\/wp-content\/uploads\/2026\/09\/1789578361262-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La tardor astron\u00f2mica acaba amb el solstici d\u2019hivern<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La tardor de 2026 finalitzar\u00e0 el <strong>21 de desembre<\/strong>, amb l\u2019arribada del solstici d\u2019hivern. En aquest moment, el Sol assolir\u00e0 la seva m\u00e0xima declinaci\u00f3 sud i, a l\u2019hemisferi nord, tindrem el dia amb menys hores de llum de tot l\u2019any.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A partir del solstici, el proc\u00e9s s\u2019invertir\u00e0 de nou: els dies comen\u00e7aran a allargar-se progressivament i les nits a escur\u00e7ar-se.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019equinocci de tardor \u00e9s, per tant, un instant prec\u00eds dins del cicle anual de la Terra, que marca la transici\u00f3 astron\u00f2mica entre l\u2019estiu i la tardor a l\u2019hemisferi nord i ens introdueix en una \u00e8poca de nits cada vegada m\u00e9s llargues i d\u2019un cel nocturn que anir\u00e0 canviant setmana rere setmana.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Benvinguda, tardor astron\u00f2mica!<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-right wp-block-paragraph\">Rub\u00e9n Maroto<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imatges propies i del web meteolluna.cat<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El moment que marca l\u2019inici de la tardor astron\u00f2mica El 23 de setembre de 2026, a les 02:05 h (hora oficial peninsular), tindr\u00e0 lloc l\u2019equinocci de tardor, l\u2019instant que marca l\u2019inici de la tardor astron\u00f2mica a l\u2019hemisferi nord. L\u2019equinocci \u00e9s un moment concret dins del moviment de la Terra al voltant del Sol. En aquest [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":948,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,9],"tags":[],"class_list":["post-935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informacio-interes","category-public"],"_links":{"self":[{"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/posts\/935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/comments?post=935"}],"version-history":[{"count":6,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/posts\/935\/revisions"}],"predecessor-version":[{"id":950,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/posts\/935\/revisions\/950"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/media\/948"}],"wp:attachment":[{"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/media?parent=935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/categories?post=935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/astrocastor.cat\/index.php\/wp-json\/wp\/v2\/tags?post=935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}