{"id":2131,"date":"2014-07-13T09:14:37","date_gmt":"2014-07-13T07:14:37","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=2131"},"modified":"2025-01-14T18:57:17","modified_gmt":"2025-01-14T17:57:17","slug":"attention-le-27-aout-piege-a-c","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/attention-le-27-aout-piege-a-c\/","title":{"rendered":"ATTENTION! Le 27 AOUT : pi\u00e8ge \u00e0 c&#8230;."},"content":{"rendered":"\n<p>J&rsquo;ai re\u00e7u plusieurs mails cette semaine me demandant de pr\u00e9ciser les conditions pour observer la plan\u00e8te rouge lorsqu&rsquo;elle va se rapprocher de la Terre et devenir \u00e0 nos yeux aussi grosse que la Lune&#8230;<\/p>\n\n\n\n<p>Cette \u00ab\u00a0information\u00a0\u00bb court depuis 2003 et revient chaque ann\u00e9e le 27 ao\u00fbt accompagn\u00e9e de son in\u00e9vitable diaporama.<\/p>\n\n\n\n<p>Bien s\u00fbr c&rsquo;est une intox et je vais essayer progressivement de vous apporter ci dessous les \u00ab\u00a0preuves\u00a0\u00bb de l&rsquo;arnaque&#8230;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ARGUMENT N\u00b01<\/h4>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1389\" height=\"1009\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars.jpg\" alt=\"\" class=\"wp-image-2132\" style=\"width:630px\" title=\"oppositionmars\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars.jpg 1389w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars-300x218.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars-1024x744.jpg 1024w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars-768x558.jpg 768w\" sizes=\"auto, (max-width: 1389px) 100vw, 1389px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-left\">&nbsp;Voici un extrait de l&rsquo;excellent \u00ab\u00a0guide du ciel\u00a0\u00bb 2003 2004 publi\u00e9 chez Nathan ( G Cannat)<\/p>\n\n\n\n<p>Effectivement en 2003, Mars s&rsquo;est bien trouv\u00e9 au plus pr\u00e8s de notre plan\u00e8te, elle n&rsquo;\u00e9tait qu&rsquo;\u00e0 55,578 millions de kilom\u00e8tres&#8230;MAIS SON DIAMETRE N&rsquo;ETAIT POURTANT QUE DE 25,1 secondes d&rsquo;arc. Les astronomes se sont r\u00e9gal\u00e9s mais Mars \u00e9tait encore bien petite&#8230; Son \u00e9clat (sa magnitude ) \u00e9tait pourtant spectaculaire ( -2.9)<\/p>\n\n\n\n<p>Sur le sch\u00e9ma ci dessus vous pouvez constater que cette ann\u00e9e en avril quand la terre a doubl\u00e9 Mars et que la plan\u00e8te rouge \u00e9tait au plus pr\u00e8s de nous, les conditions \u00e9taient bien diff\u00e9rentes : 93.051 millions de kilom\u00e8tres et seulement -1.5 de magnitude&#8230;Depuis Avril la terre continue son chemin et Mars le sien bien moins vite&#8230;La distance entre les deux plan\u00e8tes ne fait que grandir&#8230;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Le 27 AOUT n&rsquo;est donc pas la date de ce fameux rapprochement&#8230;.<\/h4>\n\n\n\n<p>Les 2 premi\u00e8res illustrations sont de&nbsp; http:\/\/astroplus.perso.neuf.fr\/phenomenes\/oppositionmarsterre.htm<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span style=\"text-decoration: underline;\">ARGUMENT N\u00b0 2<\/span><\/h4>\n\n\n\n<p>Voici un sch\u00e9ma qui vous montre les surfaces visibles \u00e0 chaque rapprochement. si 2003 et 2018 nous offrent une jolie surface vous constatez de suite que 2014 n&rsquo;est pas au top&#8230;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1003\" height=\"198\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2.jpg\" alt=\"\" class=\"wp-image-2133\" style=\"width:630px\" title=\"oppositionmars2\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2.jpg 1003w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2-300x59.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2-768x152.jpg 768w\" sizes=\"auto, (max-width: 1003px) 100vw, 1003px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span style=\"text-decoration: underline;\">ARGUMENT N\u00b03<\/span><\/h4>\n\n\n\n<p>Nous allons comparer le diam\u00e8tre des deux astres au moment le plus favorable pour leur diam\u00e8tre apparent :<\/p>\n\n\n\n<p><em>25.1 secondes d&rsquo;arc pour MARS et 31 minutes 24 secondes d&rsquo;arc au minimum pour la Lune<\/em><\/p>\n\n\n\n<p>En simplifiant les donn\u00e9es&nbsp; soit&nbsp; :<\/p>\n\n\n\n<p><em>30 &lsquo; pour la Lune et 30&Prime; pour Mars<\/em><\/p>\n\n\n\n<p>un rapide calcul mental peut vous amener \u00e0 constater que le diam\u00e8tre de la Lune peut contenir au moins 60 fois la plan\u00e8te Mars&#8230;<\/p>\n\n\n\n<p>On peut essayer de trouver la proportion exacte :<\/p>\n\n\n\n<p>Je convertis 31&prime; 24&Prime; en secondes : 31&#215;60 = 1860 secondes, j&rsquo;ajoute les 24 secondes, le diam\u00e8tre apparent de la Lune est de 1884 secondes lorsque celui de Mars est de 25.1 secondes.<\/p>\n\n\n\n<p>Si je divise 1884 par 25.1, j&rsquo;obtiens :<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">75.06<\/h1>\n\n\n\n<p><span style=\"text-decoration: underline;\">Pour mieux visualiser les choses :<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si vous tracez au sol\u00a0 un cercle de 75 cm de rayon, Mars sera figur\u00e9 par un petit cercle de 1cm de rayon<\/li>\n\n\n\n<li>Si vous tracez sur une feuille A4 un cercle de 75 mm de rayon, Mars sera figur\u00e9 par un petit cercle de 1 mm de rayon.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">On est bien loin d&rsquo;une plan\u00e8te Mars aussi grosse \u00e0 nos yeux que notre satellite la Lune<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">&nbsp;<span style=\"text-decoration: underline;\">ARGUMENT N\u00b0 4<\/span><\/h3>\n\n\n\n<p>Le Lune est en moyenne \u00e0 384 000 km de la Terre, elle a un diam\u00e8tre de 3874 km<\/p>\n\n\n\n<p>Mars est, au plus pr\u00e8s,&nbsp; \u00e0&nbsp; 56 000 000&nbsp; de km, elle a un diam\u00e8tre de 6779 km<\/p>\n\n\n\n<p>Alors, un raisonnement simple vous montre que Mars, m\u00eame pas deux fois plus grosse que la Lune, est presque 150 fois plus loin de nous&#8230;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment pourrait elle devenir aussi grande que la Lune&#8230;<\/h3>\n\n\n\n<h2 class=\"wp-block-heading\">L\u2019Origine du canular&nbsp; envoy\u00e9&nbsp; par ELIZABETH<\/h2>\n\n\n\n<p>La NASA multiplie les d\u00e9mentis \u00e0 propos d\u2019un canular qui circule sur le Web depuis 2003&nbsp;que le 27 ao\u00fbt au soir Mars s\u2019approcherait si pr\u00e8s de la Terre qu\u2019elle nous appara\u00eetrait aussi grosse que la Pleine Lune.<\/p>\n\n\n\n<p>Ce canular vient d\u2019une d\u00e9formation d\u2019une phrase d\u2019un mail qui disait&nbsp;\u00e0 propos du rapprochement de la Plan\u00e8te Rouge \u00e0 la Terre le 27 ao\u00fbt 2003 : \u00ab&nbsp;At a modest 75-power magnification Mars will look as large as the full moon to the naked eye\u00bb&nbsp;; ce qui veut dire en fait que si l\u2019on grossit Mars 75 fois, il semblerait &nbsp;aussi grand que la Lune vue \u00e0 l\u2019\u0153il nu. A l\u2019\u0153il nu, la plan\u00e8te reste un petit point brillant.<\/p>\n\n\n\n<p>Si Mars apparaissait dans notre ciel aussi grosse que la Lune, Mars serait tellement proche de la Terre qu\u2019elle aurait des effets gravitationnels catastrophiques sur la Terre. Mars a deux fois le diam\u00e8tre de la Lune&nbsp;; elle serait donc \u00e0 deux fois sa distance pour une taille apparente \u00e9gale. Mars a 9 fois la masse de la Lune et aurait donc des effets &nbsp;gravitationnels au moins deux fois plus forts que celui de la Lune.<\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_2131\" class=\"pvc_stats all  \" data-element-id=\"2131\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>J&rsquo;ai re\u00e7u plusieurs mails cette semaine me demandant de pr\u00e9ciser les conditions pour observer la plan\u00e8te rouge lorsqu&rsquo;elle va se rapprocher&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_2131\" class=\"pvc_stats all  \" data-element-id=\"2131\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":2,"featured_media":2133,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105,102,5],"tags":[],"class_list":["post-2131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archives-reperes-astro-2014","category-archives-reperes-astro","category-documentation"],"yoast_head":"<title>ATTENTION! Le 27 AOUT : pi\u00e8ge \u00e0 c.... - Rep\u00e8res Astro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reperes-astro.fr\/attention-le-27-aout-piege-a-c\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATTENTION! Le 27 AOUT : pi\u00e8ge \u00e0 c.... - Rep\u00e8res Astro\" \/>\n<meta property=\"og:description\" content=\"J&rsquo;ai re\u00e7u plusieurs mails cette semaine me demandant de pr\u00e9ciser les conditions pour observer la plan\u00e8te rouge lorsqu&rsquo;elle va se rapprocher&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/reperes-astro.fr\/attention-le-27-aout-piege-a-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Rep\u00e8res Astro\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AssoReperesAstro\/?locale=fr_FRrplanetarium\" \/>\n<meta property=\"article:published_time\" content=\"2014-07-13T07:14:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-01-14T17:57:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/oppositionmars2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1003\" \/>\n\t<meta property=\"og:image:height\" content=\"198\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Claude Grimaud\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Claude Grimaud\" \/>\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:\\\/\\\/reperes-astro.fr\\\/attention-le-27-aout-piege-a-c\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/reperes-astro.fr\\\/attention-le-27-aout-piege-a-c\\\/\"},\"author\":{\"name\":\"Claude Grimaud\",\"@id\":\"https:\\\/\\\/reperes-astro.fr\\\/#\\\/schema\\\/person\\\/df305cef14844cc5dc8a7927e48142cd\"},\"headline\":\"ATTENTION! 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