{"id":5289,"date":"2016-07-12T08:50:55","date_gmt":"2016-07-12T07:50:55","guid":{"rendered":"http:\/\/www.proantic.com\/magazine\/?p=5289"},"modified":"2016-07-18T14:03:41","modified_gmt":"2016-07-18T13:03:41","slug":"les-spheres-armillaires","status":"publish","type":"post","link":"https:\/\/www.proantic.com\/magazine\/les-spheres-armillaires\/","title":{"rendered":"Les sph\u00e8res armillaires"},"content":{"rendered":"<p>En astronomie\u00a0, une <b>sph\u00e8re armillaire<\/b>, dans son approche classique, est un instrument qui mod\u00e9lise la sph\u00e8re c\u00e9leste.\u00a0Elle est utilis\u00e9e pour montrer le mouvement\u00a0apparent des \u00e9toiles ,du soleil et de l&rsquo;\u00e9cliptique\u00a0autour de la Terre.<\/p>\n<p>Son nom provient du latin\u00a0<i>armilla<\/i> (cercle, bracelet). En effet, elle est constitu\u00e9e d&rsquo;un ensemble de cercles m\u00e9talliques ou armilles\u00a0repr\u00e9sentant la g\u00e9om\u00e9trie des \u00e9l\u00e9ments descriptifs de la sph\u00e8re c\u00e9leste.<\/p>\n<p>On peut distinguer diff\u00e9rents types de sph\u00e8res armillaires\u00a0:<\/p>\n<ul>\n<ul>\n<li>La sph\u00e8re armillaire d&rsquo;observation\u00a0;<\/li>\n<li>La sph\u00e8re armillaire classique ou p\u00e9dagogique\u00a0;<\/li>\n<li>La sph\u00e8re copernicienne.<\/li>\n<\/ul>\n<\/ul>\n<figure id=\"attachment_5296\" aria-describedby=\"caption-attachment-5296\" style=\"width: 620px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"5296\" data-permalink=\"https:\/\/www.proantic.com\/magazine\/les-spheres-armillaires\/a-3\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?fit=800%2C1200&amp;ssl=1\" data-orig-size=\"800,1200\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Sph\u00e8re armillaire ptol\u00e9ma\u00efque, XIXe si\u00e8cle.\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Sph\u00e8re armillaire ptol\u00e9ma\u00efque, XIXe si\u00e8cle.&lt;br \/&gt;\n(c) Nicolas et Cl\u00e9mence Bordet, Proantic&lt;\/p&gt;\n\" data-medium-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?fit=200%2C300&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?fit=665%2C997&amp;ssl=1\" class=\"wp-image-5296 size-large\" src=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A-683x1024.jpg?resize=620%2C930\" alt=\"Sph\u00e8re armillaire ptol\u00e9ma\u00efque, XIXe si\u00e8cle. (c) Nicolas et Cl\u00e9mence Bordet, Proantic\" width=\"620\" height=\"930\" srcset=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?resize=620%2C930&amp;ssl=1 620w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/A.jpg?w=800&amp;ssl=1 800w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/a><figcaption id=\"caption-attachment-5296\" class=\"wp-caption-text\">Sph\u00e8re armillaire ptol\u00e9ma\u00efque, XIXe si\u00e8cle.<br \/> (c) Nicolas et Cl\u00e9mence Bordet, Proantic<\/figcaption><\/figure>\n<p><strong>La sph\u00e8re armillaire d&rsquo;observation<\/strong><\/p>\n<p>Ce type de sph\u00e8re, avec un syst\u00e8me de vis\u00e9e, a servi \u00e0 d\u00e9terminer les coordonn\u00e9es c\u00e9lestes des astres \u00e0 l&rsquo;\u00e9poque de l&rsquo;astronomie pr\u00e9-t\u00e9lescopique. N\u00e9e dans l&rsquo;Antiquit\u00e9, elle dispara\u00eet pratiquement \u00e0 la fin de la Renaissance\u00a0dans les pays occidentaux. Un des derniers utilisateurs de ce type d&rsquo;instrument est l&rsquo;astronome Tycho Brahe\u00a0(1546 &#8211; 1601) qui l&rsquo;utilisa dans l&rsquo;observatoire astronomique qu&rsquo;il se fit construire dans l\u2019\u00eele de Hven . Ce dernier &#8211; comme ses pr\u00e9d\u00e9cesseurs &#8211; dans la description de ses instruments, parle d&rsquo;armilles et non de sph\u00e8re armillaire. C&rsquo;est donc sous ce vocable d&rsquo;\u00ab armille\u00a0\u00bb qu&rsquo;est d\u00e9velopp\u00e9 l&rsquo;\u00e9tude de la sph\u00e8re armillaire d&rsquo;observation.<\/p>\n<figure id=\"attachment_5292\" aria-describedby=\"caption-attachment-5292\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"5292\" data-permalink=\"https:\/\/www.proantic.com\/magazine\/les-spheres-armillaires\/91-000376-02\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?fit=500%2C650&amp;ssl=1\" data-orig-size=\"500,650\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Sph\u00e8re armillaire par Jean-Baptiste Delure et Jean Pigeon \u00e0 Paris en 1705, chambre du Dauphin\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Sph\u00e8re armillaire par Jean-Baptiste Delure et Jean Pigeon \u00e0 Paris en 1705, chambre du Dauphin&lt;br \/&gt;\n(C) RMN-Grand Palais (Ch\u00e2teau de Versailles) \/ G\u00e9rard Blot&lt;\/p&gt;\n\" data-medium-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?fit=231%2C300&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?fit=500%2C650&amp;ssl=1\" class=\"size-full wp-image-5292\" src=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?resize=500%2C650\" alt=\"Sph\u00e8re armillaire par Jean-Baptiste Delure et Jean Pigeon \u00e0 Paris en 1705, chambre du Dauphin (C) RMN-Grand Palais (Ch\u00e2teau de Versailles) \/ G\u00e9rard Blot\" width=\"500\" height=\"650\" srcset=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/91-000376-02.jpg?resize=231%2C300&amp;ssl=1 231w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-5292\" class=\"wp-caption-text\">Sph\u00e8re armillaire par Jean-Baptiste Delure et Jean Pigeon \u00e0 Paris en 1705, chambre du Dauphin<br \/>(C) RMN-Grand Palais (Ch\u00e2teau de Versailles) \/ G\u00e9rard Blot<\/figcaption><\/figure>\n<p><strong><span style=\"line-height: 1.5;\">La sph\u00e8re classique<\/span><\/strong><\/p>\n<p>C&rsquo;est la sph\u00e8re, dite de Ptol\u00e9m\u00e9e, qui a une vocation didactique.<\/p>\n<p>Les \u00e9l\u00e9ments fondamentaux sont des armilles, cercles m\u00e9talliques de la sph\u00e8re c\u00e9leste et diff\u00e9rents \u00e9l\u00e9ments suppl\u00e9mentaires ou accessoires cit\u00e9s quand n\u00e9cessaire. On trouvera \u00e0 partir de l&rsquo;ext\u00e9rieur\u00a0:<\/p>\n<div class=\"thumb tright\">\n<div class=\"thumbinner\">\n<div class=\"thumbcaption\">\n<ul>\n<li class=\"magnify\">\u00a0l&rsquo;horizon\u00a0du lieu\u00a0;<\/li>\n<li class=\"magnify\">Le m\u00e9ridien\u00a0local permettant d&rsquo;incliner l&rsquo;axe de la sph\u00e8re mouvante en fonction de la latitude.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<p>Ces deux armilles sont les r\u00e9f\u00e9rences locales\u00a0; elles sont suppos\u00e9es \u00eatre fixes avec<\/p>\n<ul>\n<li>l&rsquo;axe des p\u00f4les ou axe de la sph\u00e8re c\u00e9leste autour duquel vont tourner les \u00e9l\u00e9ments suivants\u00a0:<\/li>\n<li>l&rsquo;\u00e9quateur c\u00e9leste;<\/li>\n<li>l&rsquo;\u00e9cliptique, chemin apparent parcouru par le Soleil dans le ciel, jalonn\u00e9 par les constellations zodiacales;<\/li>\n<li>les deux cercles polaires\u00a0et les deux tropiques\u00a0dont la position d\u00e9pend de l&rsquo;\u00e9cliptique.<\/li>\n<li>parfois sont ajout\u00e9s les colures\u00a0des solstices et des \u00e9quinoxes, m\u00e9ridiens c\u00e9lestes passant par les positions \u00e9cliptiques du Soleil aux d\u00e9buts des saisons.<\/li>\n<\/ul>\n<p>En g\u00e9n\u00e9ral, une boule repr\u00e9sentant la Terre\u00a0est plac\u00e9e au centre des cercles sur l&rsquo;axe des p\u00f4les\u00a0; on trouve aussi parfois le soleil et la lune, r\u00e9glables en position.<\/p>\n<p>Un pied, li\u00e9 \u00e0 l&rsquo;horizon fixe, sert de support g\u00e9n\u00e9ral \u00e0 l&rsquo;ensemble.<\/p>\n<figure id=\"attachment_5293\" aria-describedby=\"caption-attachment-5293\" style=\"width: 620px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"5293\" data-permalink=\"https:\/\/www.proantic.com\/magazine\/les-spheres-armillaires\/186309-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?fit=851%2C1200&amp;ssl=1\" data-orig-size=\"851,1200\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Sph\u00e8re armillaire copernicienne\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Sph\u00e8re armillaire copernicienne, XIXe si\u00e8cle.&lt;br \/&gt;\n(c) Nicolas et Cl\u00e9mence Bordet, Proantic&lt;\/p&gt;\n\" data-medium-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?fit=213%2C300&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?fit=665%2C938&amp;ssl=1\" class=\"wp-image-5293 size-large\" src=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1-726x1024.jpg?resize=620%2C874\" alt=\"Sph\u00e8re armillaire copernicienne, XIXe si\u00e8cle. (c) Nicolas et Cl\u00e9mence Bordet, Proantic\" width=\"620\" height=\"874\" srcset=\"https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?resize=726%2C1024&amp;ssl=1 726w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?resize=213%2C300&amp;ssl=1 213w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?resize=768%2C1083&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?resize=620%2C874&amp;ssl=1 620w, https:\/\/i0.wp.com\/www.proantic.com\/magazine\/wp-content\/uploads\/2016\/07\/186309-1.jpg?w=851&amp;ssl=1 851w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/a><figcaption id=\"caption-attachment-5293\" class=\"wp-caption-text\">Sph\u00e8re armillaire copernicienne, XIXe si\u00e8cle.<br \/> (c) Nicolas et Cl\u00e9mence Bordet, Proantic<\/figcaption><\/figure>\n<p><strong>La sph\u00e8re copernicienne<\/strong><\/p>\n<p>\u00c0 la fin du <span class=\"romain\">xvii<\/span><sup>e<\/sup>\u00a0si\u00e8cle et surtout au <span class=\"romain\">xviii<\/span><sup>e<\/sup>\u00a0si\u00e8cle appara\u00eet la sph\u00e8re copernicienne, qui essaie de repr\u00e9senter le syst\u00e8me solaire. S&rsquo;inspirant de la sph\u00e8re armillaire g\u00e9ocentrique, elle met au centre le soleil. Il est entour\u00e9 d&rsquo;un certain nombre d&rsquo;armilles essayant de mat\u00e9rialiser les orbites des diff\u00e9rentes plan\u00e8tes du syst\u00e8me. Des boules sont incluses repr\u00e9sentant la Terre, la Lune, Jupiter, Saturne, etc. Les armilles tournent pratiquement toutes autour de l&rsquo;axe \u00e9cliptique, faisant de la sph\u00e8re un objet assez lourd et inesth\u00e9tique. On lui pr\u00e9f\u00e9rera les plan\u00e9taires\u00a0o\u00f9 les armilles dispara\u00eetront en partie.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En astronomie\u00a0, une sph\u00e8re armillaire, dans son approche classique, est un instrument qui mod\u00e9lise la sph\u00e8re c\u00e9leste.\u00a0Elle est utilis\u00e9e pour montrer le mouvement\u00a0apparent des \u00e9toiles ,du soleil et de l&rsquo;\u00e9cliptique\u00a0autour de la Terre. Son nom provient du latin\u00a0armilla (cercle, bracelet). En effet, elle est constitu\u00e9e d&rsquo;un ensemble de cercles m\u00e9talliques ou armilles\u00a0repr\u00e9sentant la g\u00e9om\u00e9trie des [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":5294,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[180],"tags":[562],"class_list":["post-5289","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arts-decoratifs-proantic","tag-sphere-armillaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - 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