{"id":51907,"date":"2023-06-01T10:02:02","date_gmt":"2023-06-01T10:02:02","guid":{"rendered":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/"},"modified":"2023-06-02T13:08:43","modified_gmt":"2023-06-02T13:08:43","slug":"jacques-laskar-terre-lune","status":"publish","type":"event","link":"https:\/\/www.ifg.gr\/fr\/events\/jacques-laskar-terre-lune\/","title":{"rendered":"Jacques Laskar : \u00c0 la recherche d’un sc\u00e9nario coh\u00e9rent pour l’\u00e9volution du syst\u00e8me Terre-Lune"},"content":{"rendered":"

Dans le cadre du partenariat, entre le service de coop\u00e9ration et d\u2019action culturelle de l\u2019Ambassade de France en Gr\u00e8ce-Institut fran\u00e7ais de Gr\u00e8ce et la Fondation Eugenid\u00e8s<\/a>, Jacques Laskar<\/strong>, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences<\/a>, pr\u00e9sentera \u00e0 Ath\u00e8nes une conf\u00e9rence intitul\u00e9e \u00ab \u00c0 la recherche d’un sc\u00e9nario coh\u00e9rent pour l’\u00e9volution du syst\u00e8me Terre-Lune<\/strong> \u00bb.<\/p>\n

Ce sujet fait partie des principaux th\u00e8mes abord\u00e9s dans de nombreuses repr\u00e9sentations du nouveau plan\u00e9tarium num\u00e9rique de la Fondation Eugenides, Vassilios Harmandaris<\/strong>, directeur de l’Institut d’astrophysique de la Fondation pour la recherche et la technologie-Gr\u00e8ce, pr\u00e9sentera l\u2019astronome fran\u00e7ais Jacques Laskar. Puis, le directeur du plan\u00e9tarium, Manos Kitsonas<\/strong>, introduira le th\u00e8me de la conf\u00e9rence et animera la discussion qui s\u2019ensuivra avec le public.<\/p>\n

Depuis les travaux de Georges Darwin en 1880, on sait qu\u2019en raison de l\u2019interaction des mar\u00e9es entre la Terre et la Lune, la rotation de la Terre ralentit et la Lune s\u2019\u00e9loigne de la Terre.<\/h3>\n

Cela a d\u2019abord \u00e9t\u00e9 d\u00e9duit \u00e0 partir des observations des \u00e9clipses anciennes, et depuis 1969, gr\u00e2ce aux r\u00e9flecteurs laser d\u00e9pos\u00e9s par les astronautes des missions Apollo, le rythme de cet \u00e9loignement a \u00e9t\u00e9 mesur\u00e9 avec une pr\u00e9cision extr\u00eame, pour une valeur de 3,83 cm\/an. Depuis les missions lunaires, l\u2019\u00e2ge de la Lune a \u00e9galement \u00e9t\u00e9 d\u00e9termin\u00e9 avec pr\u00e9cision, \u00e0 4,425 Ga.<\/p>\n

Par ailleurs<\/strong>, il s\u2019est aussi av\u00e9r\u00e9, il y a plus de cinquante ans, qu\u2019avec le taux de friction actuel qui survient \u00e0 cause des mar\u00e9es, le mod\u00e8le de mar\u00e9e simple de Darwin indique qu\u2019a sa gen\u00e8se, la Lune n\u2019a cess\u00e9 de s\u2019\u00e9loigner, depuis environ 1,5 Ga, ce qui s\u2019av\u00e8re \u00eatre incompatible avec son \u00e2ge.<\/p>\n

Jacques Laskar pr\u00e9sentera les derniers r\u00e9sultats qui r\u00e9pondent d\u00e9sormais \u00e0 ce paradoxe.<\/h3>\n

\"\"<\/p>\n

\"\"<\/p>\n

________________________<\/p>\n

Pr\u00e9sentation des intervenants :<\/h3>\n

\"\"<\/p>\n

Jacques LASKAR<\/strong> est astronome \u00e0 l\u2019Observatoire de Paris<\/a>, directeur de recherche au CNRS<\/a>, membre du Bureau des Longitudes<\/a> et de l\u2019Acad\u00e9mie des sciences<\/a>. Il travaille sur la dynamique des syst\u00e8mes plan\u00e9taires. Il a re\u00e7u la m\u00e9daille d’argent du CNRS en 1994. L’ast\u00e9ro\u00efde (18605)<\/a> porte le nom de Jacques Laskar (ainsi nomm\u00e9 en son honneur en 1998).<\/p>\n

\"\"<\/p>\n

Vassilis CHARMANDARIS<\/strong> est professeur d’astrophysique au sein du d\u00e9partement de Physique de l’Universit\u00e9 de Cr\u00e8te<\/a> et directeur de l’Institut d’astrophysique de FORTH<\/a> ainsi que de l’Observatoire de Skinakas. Il est conseiller scientifique aupr\u00e8s de l’Agence spatiale europ\u00e9enne<\/a>, membre du conseil scientifique de l’Institut des sciences de l\u2019univers du CNRS<\/a>, et vice-pr\u00e9sident du conseil de la revue scientifique \u00ab Astronomy & Astrophysics<\/a> \u00bb.<\/p>\n","protected":false},"excerpt":{"rendered":"

Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s. Entr\u00e9e libre \/ \u03a4raduction simultan\u00e9e.<\/p>\n","protected":false},"author":18,"featured_media":51889,"template":"","tags":[1490,1491,1492,1487,1488,1489,1217,1214],"event_category":[875],"event_group":[],"class_list":["post-51907","event","type-event","status-publish","has-post-thumbnail","hentry","tag-systemes-planetaires","tag-astrophysique","tag-observatoire","tag-planitika-systimata-fr","tag-astrofysiki-fr","tag-asteroskopeio-fr","tag-science","tag-epistimi-fr","event_category-debat-didees-et-sciences"],"acf":{"sponsors_default":false,"info_title":"","info_text":"","date_range":{"start":"28\/06\/2023","end":"","cancelled":false,"note":"","start_time":"19:00","end_time":"20:30"},"details":{"location":"

Fondation Eugenid\u00e8s (Leof. Syggrou 387, Faliro, 210-9469600)<\/p>\n

*Attestations de pr\u00e9sence : d\u00e9livr\u00e9es exclusivement aux personnes pr\u00e9sentes dans l\u2019auditorium, \u00e0 la sortie de la conf\u00e9rence.<\/p>\n","hyperlink1a":{"text":"","link":""},"price":"Entr\u00e9e libre \/ \u03a4raduction simultan\u00e9e ","hyperlink2a":{"text":"","link":""},"online_event":false,"live_streaming":false,"live_streaming_code":"","facebook_url":"https:\/\/www.facebook.com\/events\/773717494225258?ref=newsfeed","hyperlink":{"text":"","link":""},"hyperlink2":{"text":"","link":""},"hyperlink3":{"text":"","link":""},"press_release":false},"featured_image_credits":"","home_slider_image":{"ID":51891,"id":51891,"title":"LASKAR_1300x768","filename":"LASKAR_1300x768.jpg","filesize":748714,"url":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","link":"https:\/\/www.ifg.gr\/fr\/events\/jacques-laskar-terre-lune\/laskar_1300x768\/","alt":"","author":"18","description":"","caption":"","name":"laskar_1300x768","status":"inherit","uploaded_to":51907,"date":"2023-06-01 09:57:10","modified":"2023-06-01 09:57:10","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.ifg.gr\/wp-includes\/images\/media\/default.png","width":1300,"height":768,"sizes":{"thumbnail":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","thumbnail-width":150,"thumbnail-height":89,"medium":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","medium-width":300,"medium-height":177,"medium_large":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768-768x454.jpg","medium_large-width":640,"medium_large-height":378,"large":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","large-width":640,"large-height":378,"1536x1536":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","1536x1536-width":1300,"1536x1536-height":768,"2048x2048":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","2048x2048-width":1300,"2048x2048-height":768,"full-width":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","full-width-width":1300,"full-width-height":768,"sidebar":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","sidebar-width":1300,"sidebar-height":768,"thumb-sm":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768-220x130.jpg","thumb-sm-width":220,"thumb-sm-height":130,"thumb-square":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768-300x300.jpg","thumb-square-width":300,"thumb-square-height":300,"thumb-big":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768-600x400.jpg","thumb-big-width":600,"thumb-big-height":400,"slider-big":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1300x768.jpg","slider-big-width":1300,"slider-big-height":768}},"sponsors_group":false,"layout":false},"yoast_head":"\nJacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune<\/title>\n<meta name=\"description\" content=\"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.\" \/>\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.ifg.gr\/events\/jacques-laskar-gi-selini\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune\" \/>\n<meta property=\"og:description\" content=\"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/\" \/>\n<meta property=\"og:site_name\" content=\"IFG\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-02T13:08:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/\",\"url\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/\",\"name\":\"Jacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune\",\"isPartOf\":{\"@id\":\"https:\/\/www.ifg.gr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg\",\"datePublished\":\"2023-06-01T10:02:02+00:00\",\"dateModified\":\"2023-06-02T13:08:43+00:00\",\"description\":\"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage\",\"url\":\"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg\",\"contentUrl\":\"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg\",\"width\":1200,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.ifg.gr\/fr\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Events\",\"item\":\"https:\/\/www.ifg.gr\/events\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Jacques Laskar : \u00c0 la recherche d’un sc\u00e9nario coh\u00e9rent pour l’\u00e9volution du syst\u00e8me Terre-Lune\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.ifg.gr\/#website\",\"url\":\"https:\/\/www.ifg.gr\/\",\"name\":\"IFG\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.ifg.gr\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Jacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune","description":"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/","og_locale":"fr_FR","og_type":"article","og_title":"Jacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune","og_description":"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.","og_url":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/","og_site_name":"IFG","article_modified_time":"2023-06-02T13:08:43+00:00","og_image":[{"width":1200,"height":800,"url":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/","url":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/","name":"Jacques Laskar : \u00c0 la recherche d'un sc\u00e9nario pour le syst\u00e8me Terre-Lune","isPartOf":{"@id":"https:\/\/www.ifg.gr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage"},"image":{"@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage"},"thumbnailUrl":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg","datePublished":"2023-06-01T10:02:02+00:00","dateModified":"2023-06-02T13:08:43+00:00","description":"Conf\u00e9rence de Jacques Laskar, astronome fran\u00e7ais et membre de l\u2019Acad\u00e9mie des sciences, \u00e0 la Fondation Eugenid\u00e8s.","breadcrumb":{"@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#primaryimage","url":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg","contentUrl":"https:\/\/www.ifg.gr\/wp-content\/uploads\/2023\/06\/LASKAR_1200x800.jpg","width":1200,"height":800},{"@type":"BreadcrumbList","@id":"https:\/\/www.ifg.gr\/events\/jacques-laskar-gi-selini\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ifg.gr\/fr\/"},{"@type":"ListItem","position":2,"name":"Events","item":"https:\/\/www.ifg.gr\/events\/"},{"@type":"ListItem","position":3,"name":"Jacques Laskar : \u00c0 la recherche d’un sc\u00e9nario coh\u00e9rent pour l’\u00e9volution du syst\u00e8me Terre-Lune"}]},{"@type":"WebSite","@id":"https:\/\/www.ifg.gr\/#website","url":"https:\/\/www.ifg.gr\/","name":"IFG","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ifg.gr\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"}]}},"_links":{"self":[{"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/event\/51907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/event"}],"about":[{"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/types\/event"}],"author":[{"embeddable":true,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/users\/18"}],"version-history":[{"count":0,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/event\/51907\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/media\/51889"}],"wp:attachment":[{"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/media?parent=51907"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/tags?post=51907"},{"taxonomy":"event_category","embeddable":true,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/event_category?post=51907"},{"taxonomy":"event_group","embeddable":true,"href":"https:\/\/www.ifg.gr\/fr\/wp-json\/wp\/v2\/event_group?post=51907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}