{"id":11786,"date":"2020-04-07T09:09:32","date_gmt":"2020-04-07T09:09:32","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11786"},"modified":"2020-04-08T07:22:40","modified_gmt":"2020-04-08T07:22:40","slug":"ce-soir-admirez-la-plus-grosse-pleine-lune-de-lannee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/07\/ce-soir-admirez-la-plus-grosse-pleine-lune-de-lannee\/","title":{"rendered":"Ce soir admirez la plus grosse Pleine Lune de l’ann\u00e9e"},"content":{"rendered":"

Ce mardi 7 avril en d\u00e9but de soir\u00e9e vous pourrez voir se lever la plus grosse Pleine Lune de l’ann\u00e9e. Un joli spectacle qui n\u00e9cessite quelques explications.<\/strong><\/p>\n

Lorsque le Soleil passera sous l’horizon ce soir, tournez vous dans la direction oppos\u00e9e. Vous d\u00e9couvrirez alors la Pleine Lune tr\u00f4nant au-dessus de l’horizon EST. Notre satellite naturel se situera \u00e0 un peu moins de 358.000 km de nous et pr\u00e9sentera alors un diam\u00e8tre apparent sup\u00e9rieur \u00e0 33 minutes d’arc. Vous observerez alors la plus grosse Pleine Lune de l’ann\u00e9e. Vous pouvez \u00e9galement immortaliser l’instant avec n’importe quel appareil photo (ou t\u00e9l\u00e9phone) en le laissant en mode automatique.<\/p>\n

\"\"<\/a>
Pleine Lune derri\u00e8re le clocher de l’\u00e9glise de Brochon. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

En raison de son orbite elliptique, la Lune n\u2019est pas toujours \u00e0 la m\u00eame distance de la Terre. Au plus pr\u00e8s, le p\u00e9rig\u00e9e<\/strong>, cette distance est de 356.700 km ; au plus loin,\u00a0l\u2019apog\u00e9e<\/strong>, la Lune se trouve \u00e0 406.300 km.<\/p>\n

Cette variation de distance induit automatiquement une variation du diam\u00e8tre lunaire apparent qui oscille entre 29,5 minutes d\u2019arc \u00e0\u00a0l\u2019apog\u00e9e<\/strong>\u00a0et 33,5 minutes d\u2019arc au\u00a0p\u00e9rig\u00e9e<\/strong>, soit une diff\u00e9rence de 12%. Au fil des lunaisons cette variation du diam\u00e8tre apparent lunaire concerne donc toutes les phases de notre satellite naturel (croissant<\/a>,\u00a0Quartier<\/a>,\u00a0Lune gibbeuse<\/a>\u2026). Quand le plus grand diam\u00e8tre apparent se produit au moment de la Pleine Lune (comme cette nuit) on a pris l\u2019habitude de parler de Super Lune.<\/strong><\/p>\n

\"\"<\/a>
diff\u00e9rence de diam\u00e8tre apparent entre la Pleine Lune au p\u00e9rig\u00e9e \u00e0 gauche et \u00e0 l\u2019apog\u00e9e \u00e0 droite. \u00a9 Eliot Herman<\/figcaption><\/figure>\n

Le terme s’applique a toute Pleine Lune dont le diam\u00e8tre apparent d\u00e9passe 33 minutes d\u2019arc. Mais attention : ce ph\u00e9nom\u00e8ne est imperceptible \u00e0 l\u2019\u0153il nu. En effet, m\u00eame si une diff\u00e9rence de taille de 12% n\u2019est pas anodine, impossible quand on regarde une Super Lune<\/strong> de la comparer mentalement \u00e0 une Pleine Lune \u00e0 l\u2019apog\u00e9e observ\u00e9e six mois plus t\u00f4t. Ce comparatif n\u2019est possible qu\u2019\u00e0 l\u2019aide d\u2019un montage photo comme ci-dessus.<\/p>\n

Pour autant ne vous privez pas du spectacle ce soir : un lever de Pleine Lune est toujours tr\u00e8s beau !<\/p>\n","protected":false},"excerpt":{"rendered":"

Ce mardi 7 avril en d\u00e9but de soir\u00e9e vous pourrez voir se lever la plus grosse Pleine Lune de l’ann\u00e9e. Un joli spectacle qui n\u00e9cessite quelques explications. Lorsque le Soleil passera sous l’horizon ce soir, tournez vous dans la direction oppos\u00e9e. Vous d\u00e9couvrirez alors la Pleine Lune tr\u00f4nant au-dessus de l’horizon EST. Notre satellite naturel … Continuer la lecture de Ce soir admirez la plus grosse Pleine Lune de l’ann\u00e9e<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2632],"class_list":["post-11786","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-on-the-moon"],"yoast_head":"\nCe soir admirez la plus grosse Pleine Lune de l'ann\u00e9e<\/title>\n<meta name=\"description\" content=\"Ce mardi 7 avril en d\u00e9but de soir\u00e9e vous pourrez voir se lever la plus grosse Pleine Lune de l'ann\u00e9e. 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