{"id":25542,"date":"2026-02-10T12:00:00","date_gmt":"2026-02-10T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/guinee-equatoriale\/politique\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques"},"modified":"2026-02-11T00:48:31","modified_gmt":"2026-02-11T00:48:31","slug":"catalogue-dhipparque-revele-nouveaux-secrets-astronomiques","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques","title":{"rendered":"Catalogue D\u2019Hipparque R\u00e9v\u00e8le Nouveaux Secrets Astronomiques"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Guinee Equatoriale. <\/strong><\/span>L\u2019existence du catalogue d\u2019e\u0301toiles d\u2019Hipparque, re\u0301dige\u0301 par l\u2019astronome grec, entre -170 et -120 avant notre e\u0300re, longtemps hypothe\u0301tique, s\u2019est concre\u0301tise\u0301e en 2022 avec la de\u0301couverte d\u2019extraits de ce texte fondateur, cache\u0301s dans un manuscrit du Moyen A\u0302ge, le Codex Climaci Rescriptus, provenant du monaste\u0300re de Sainte Catherine, au Sinai\u0308. Le texte a e\u0301te\u0301 re\u0301dige\u0301 sur des feuillets bien plus vieux et efface\u0301s pour e\u0302tre re\u0301utilise\u0301s, ce que les spe\u0301cialistes nomment des palimpsestes. Mais l\u2019ancien texte n\u2019a pas totalement disparu et certains folios ont re\u0301ve\u0301le\u0301 l\u2019existence d\u2019un poe\u0300me grec, Les Phaenomena d\u2019Aratos de Soles e\u0301crit 300 ans avant notre e\u0300re, avec, parmi les e\u0301le\u0301ments de commentaire de ce poe\u0300me, des annotations issues du catalogue d\u2019Hipparque, probablement couche\u0301es sur parchemin au 6e sie\u0300cle apre\u0300s J.-C.<\/p>\n<p><b>Lire plus loin sous le texte me\u0301die\u0301val<\/b><\/p>\n<p>Une nouvelle campagne d\u2019analyses permet de\u0301sormais d\u2019aller plus loin et de lire davantage de lignes de ce catalogue longtemps conside\u0301re\u0301 comme perdu. Le support est le Codex Climaci Rescriptus, un palimpseste. Apre\u0300s l\u2019imagerie multispectrale, qui avait de\u0301ja\u0300 re\u0301ve\u0301le\u0301 des coordonne\u0301es associe\u0301es a\u0300 certaines constellations, les chercheurs exploitent de\u0301sormais la fluorescence X au Centre de l\u2019acce\u0301le\u0301rateur line\u0301aire de Stanford (SLAC) a\u0300 l\u2019aide du synchrotron du Stanford Synchrotron Radiation Lightsource. Cette approche repose sur la composition chimique distincte des encres. L\u2019encre me\u0301die\u0301vale, riche en fer, se distingue nettement de l\u2019encre antique, domine\u0301e par le calcium.<\/p>\n<p>Onze folios, recto et verso, ont ainsi e\u0301te\u0301 analyse\u0301s et \u00ab les re\u0301sultats vont bien au-dela\u0300 de nos espe\u0301rances \u00bb, se re\u0301jouit Victor Gysembergh du Centre Le\u0301on Robin de recherche sur la pense\u0301e antique qui coordonne ces travaux. La fluorescence X a permis de re\u0301ve\u0301ler l\u2019existence de nouvelles coordonne\u0301es e\u0301quatoriales d\u2019e\u0301toiles ainsi que des illustrations repre\u0301sentant des constellations dont l\u2019identification est en cours. \u00ab Ces nouvelles donne\u0301es corroborent l\u2019ide\u0301e qu\u2019Hipparque avait re\u0301alise\u0301 un catalogue de l\u2019ensemble du ciel visible \u00bb, souligne le chercheur.<\/p>\n<p>Les observations de l\u2019astronome ont probablement e\u0301te\u0301 re\u0301alise\u0301es depuis l\u2019i\u0302le de Rhodes. Elles vont e\u0301galement concourir a\u0300 mieux comprendre les me\u0301thodes d\u2019observation des Grecs. Leur pre\u0301cision permet de dater les observations. En tenant compte de la pre\u0301cession de l\u2019axe de rotation de la Terre, les calculs convergent vers une pe\u0301riode situe\u0301e autour de 129 avant J.-C., date qui coi\u0308ncide avec l\u2019activite\u0301 d\u2019Hipparque. Les mesures sont exactes a\u0300 environ un degre\u0301, une performance notable pour des observations re\u0301alise\u0301es a\u0300 l\u2019\u0153il nu \u00ab mais les nouvelles coordonne\u0301es obtenues vont aussi permettre d\u2019affiner le niveau de pre\u0301cision qu\u2019avait Hipparque \u00bb.<\/p>\n<p>La poursuite des analyses renforce aussi la comparaison avec le catalogue de Claude Ptole\u0301me\u0301e. Les diffe\u0301rences de coordonne\u0301es confirment que Ptole\u0301me\u0301e n\u2019a pas simplement recopie\u0301 le travail de son pre\u0301de\u0301cesseur, mais qu\u2019il a combine\u0301 plusieurs sources. A\u0300 terme, la lecture de nouveaux feuillets pourrait permettre de mieux estimer comment a travaille\u0301 Ptole\u0301me\u0301e.<\/p>\n<p><b>La poursuite des textes anciens<\/b><\/p>\n<p>Cette recherche s\u2019inscrit dans un contexte bien plus vaste. Le monaste\u0300re de Sainte Catherine conserve des milliers de parchemins anciens qui n\u2019ont encore jamais e\u0301te\u0301 analyse\u0301s avec ces me\u0301thodes. En sondant sous les textes visibles, les chercheurs peuvent aussi bien faire apparai\u0302tre des traite\u0301s scientifiques que des textes litte\u0301raires ou religieux, y compris d\u2019anciennes versions de la Bible. \u00ab Retrouver des morceaux du catalogue d\u2019Hipparque revient a\u0300 chercher une aiguille dans une botte de foin, mais on peut trouver d\u2019autres aiguilles tout aussi inte\u0301ressantes \u00bb, avertit le chercheur.<\/p>\n<p>Cette approche est au c\u0153ur du projet PALAI (pour \u00ab PALimpsests: Artificial Intelligence applied to advanced imaging of recycled manuscripts \u00bb), re\u0301cemment lance\u0301 par une e\u0301quipe dirige\u0301e par Victor Gysembergh. Ce projet, finance\u0301 par une bourse europe\u0301enne, vise a\u0300 e\u0301tudier a\u0300 grande e\u0301chelle un corpus exceptionnel de palimpsestes produits en Italie du Nord au de\u0301but du Moyen A\u0302ge, en combinant imagerie avance\u0301e et intelligence artificielle afin d\u2019acce\u0301le\u0301rer la lecture des textes efface\u0301s. L\u2019objectif n\u2019est pas seulement de re\u0301ve\u0301ler des textes enfouis, mais de comprendre comment ces manuscrits ont e\u0301te\u0301 produits, recycle\u0301s et transmis, et de constituer des corpus exploitables pour les historiens et les philologues.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Guinee Equatoriale<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Guinee Equatoriale. L\u2019existence du catalogue d\u2019e\u0301toiles d\u2019Hipparque, re\u0301dige\u0301 par l\u2019astronome grec, entre -170 et -120 avant notre e\u0300re, longtemps hypothe\u0301tique, s\u2019est concre\u0301tise\u0301e en 2022 avec la de\u0301couverte d\u2019extraits de ce texte fondateur, cache\u0301s dans un manuscrit du Moyen A\u0302ge, le Codex Climaci Rescriptus, provenant du monaste\u0300re de Sainte Catherine, au Sinai\u0308. Le texte [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":25541,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[50],"class_list":["post-25542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-guinee-equatoriale"],"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>Catalogue D\u2019Hipparque R\u00e9v\u00e8le Nouveaux Secrets Astronomiques - Guin\u00e9e \u00e9quatoriale<\/title>\n<meta name=\"description\" content=\"L\u2019existence du catalogue d\u2019e\u0301toiles d\u2019Hipparque, re\u0301dige\u0301 par l\u2019astronome grec, entre -170 et -120 avant notre e\u0300re, lon ...\" \/>\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\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Catalogue D\u2019Hipparque R\u00e9v\u00e8le Nouveaux Secrets Astronomiques\" \/>\n<meta property=\"og:description\" content=\"L\u2019existence du catalogue d\u2019e\u0301toiles d\u2019Hipparque, re\u0301dige\u0301 par l\u2019astronome grec, entre -170 et -120 avant notre e\u0300re, lon ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\" \/>\n<meta property=\"og:site_name\" content=\"Guin\u00e9e \u00e9quatoriale\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-10T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-11T00:48:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/guinee-equatoriale\/sites\/53\/2026\/02\/sm_1770799549.199138.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Catalogue D\u2019Hipparque R\u00e9v\u00e8le Nouveaux Secrets Astronomiques\",\"datePublished\":\"2026-02-10T12:00:00+00:00\",\"dateModified\":\"2026-02-11T00:48:31+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\"},\"wordCount\":823,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/guinee-equatoriale\/sites\/53\/2026\/02\/sm_1770799549.199138.jpg\",\"keywords\":[\"Guinee Equatoriale\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\",\"url\":\"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/catalogue-dhipparque-revele-nouveaux-secrets-astronomiques\",\"name\":\"Catalogue D\u2019Hipparque R\u00e9v\u00e8le Nouveaux Secrets Astronomiques - 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