{"id":11514,"date":"2025-05-14T08:00:00","date_gmt":"2025-05-14T06:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=11514"},"modified":"2025-05-08T11:03:44","modified_gmt":"2025-05-08T09:03:44","slug":"retournement-au-meridien","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2025\/05\/14\/retournement-au-meridien\/","title":{"rendered":"Retournement au m\u00e9ridien"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-1024x768.jpg\" alt=\"\" class=\"wp-image-11515\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-1024x768.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-300x225.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-768x576.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-1536x1152.jpg 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG-400x300.jpg 400w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/astronomieJPG.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Depuis que j\u2019ai d\u00e9but\u00e9 l\u2019astro photographie tout le monde me parle du retournement au m\u00e9ridien. Cette manipulation myst\u00e9rieuse de la monture se produit pendant une soir\u00e9e de shooting.&nbsp;<\/p>\n\n\n\n<p>Comme je suis d\u00e9butant et ignare, je me suis persuad\u00e9 que cette manoeuvre n\u2019\u00e9tait r\u00e9serv\u00e9e qu\u2019aux puristes pointilleux.&nbsp;<\/p>\n\n\n\n<p>J\u2019avais cru comprendre qu\u2019il \u00e9tait question de la position du miroir du t\u00e9lescope pendant la course de l\u2019instrument pendant la nuit. Je croyais donc que je n\u2019\u00e9tais pas concern\u00e9 par le sujet avec ma lunette et comme je ne voulais pas passer pour un imb\u00e9cile, je n\u2019ai pas demand\u00e9. J\u2019ai eu tord.<\/p>\n\n\n\n<p>Le passage au m\u00e9ridien concerne l\u2019objet que l\u2019on poursuit dans le ciel. Lors de sa course effr\u00e9n\u00e9e d\u2019est en ouest, celui-ci va couper une ligne imaginaire, lorsqu\u2019il est au plus haut dans le ciel, le fameux m\u00e9ridien en question.&nbsp;<\/p>\n\n\n\n<p>Une monture \u00e9quatoriale peut se trouver en difficult\u00e9 lorsque l\u2019objet approche du m\u00e9ridien. L\u2019axe de d\u00e9clinaison arrive \u00e0 une limite o\u00f9 l\u2019instrument, lunette ou t\u00e9lescope, est en \u00e9quilibre pr\u00e9caire et que le tube risque de buter contre sa monture.&nbsp;<\/p>\n\n\n\n<p>Combien de fois ma lunette s\u2019est retrouv\u00e9e coinc\u00e9e apr\u00e8s une \u00e0 deux heures de travail ? Combien de fois le guidage s\u2019est interrompu en quelques plein shooting ? C\u00e2ble trop tendu, lunette guide bloqu\u00e9e contre la monture, d\u00e9branchement intempestif d\u2019un \u00e9quipement. Plein d\u2019incidents incompr\u00e9hensibles jusqu\u2019\u00e0 que je me penche sur ce fameux retournement au m\u00e9ridien.<\/p>\n\n\n\n<p>Pour \u00e9viter ces gal\u00e8res et \u00e9ventuellement de la casse, il suffit de s\u2019accorder une petite pause pendant la soir\u00e9e.&nbsp;<\/p>\n\n\n\n<p>Vous devez tout d\u2019abord interrompre la session photographique quelques minutes avant le passage au m\u00e9ridien. Patientez un peu afin que l\u2019objet franchisse la ligne imaginaire, repositionnez l\u2019instrument et reprendrenez la session. Cela signifie placer l\u2019instrument en position initiale face \u00e0 l\u2019\u00e9toile polaire puis pointer \u00e0 nouveau l\u2019objet en basculant de l\u2019autre c\u00f4t\u00e9 de la monture et relancer le guidage. Cela peut prendre une quinzaine de minutes et il faut v\u00e9rifier vos c\u00e2bles lors de la manoeuvre.<\/p>\n\n\n\n<p>Et donc, j\u2019ai enfin proc\u00e9d\u00e9 \u00e0 mon premier retournement au m\u00e9ridien volontaire il y a peu. Car maintenant que j\u2019utilise des filtres, je fais \u00e9galement des poses beaucoup plus longues. Il y a encore quelques semaines je photographiais pendant une heure, deux au maximum, \u00e9chappant souvent par miracle au retournement au m\u00e9ridien. Mais ce soir l\u00e0, j\u2019ai laiss\u00e9 la cam\u00e9ra travailler plus de trois heures d\u2019affil\u00e9e et lorsqu\u2019un de mes voisins a parl\u00e9 de retournement au m\u00e9ridien, j\u2019ai consult\u00e9 la carte du ciel pour v\u00e9rifier o\u00f9 en \u00e9tait la galaxie par rapport au m\u00e9ridien. Et en l\u2019occurrence, il me restait \u00e0 peine une demi-heure avant qu\u2019un nouveau drame ne se produise.&nbsp;<\/p>\n\n\n\n<p>Cinq minutes avant le passage au m\u00e9ridien, j\u2019ai arr\u00eat\u00e9 le guidage et l\u2019empilement des images. J\u2019ai plac\u00e9 la monture en position initiale et patient\u00e9 jusqu\u2019au franchissement du fameux m\u00e9ridien. J\u2019ai point\u00e9 \u00e0 nouveau l\u2019objet,&nbsp; mais sans doute trop t\u00f4t. La monture est revenue quasiment dans la position pr\u00e9c\u00e9dente, incapable de travailler ainsi. Alors j\u2019ai recommenc\u00e9 cinq minutes plus tard et la lunette est pass\u00e9e de l\u2019autre c\u00f4t\u00e9 de l\u2019axe. J\u2019avais proc\u00e9d\u00e9 au retournement de m\u00e9ridien. J\u2019ai relanc\u00e9 le guidage, v\u00e9rifi\u00e9 que tout \u00e9tait nominal et recommenc\u00e9 \u00e0 empiler des images de 300 secondes. C\u2019\u00e9tait reparti pour deux nouvelles heures de photographie.<\/p>\n\n\n\n<p>Ce qui m\u2018effrayait au d\u00e9but, c\u2019\u00e9tait de travailler avec deux s\u00e9ries d\u2019images diff\u00e9rentes lors du traitement. Mais les logiciels comme Siril ou Pixinsight g\u00e8rent parfaitement ce genre de chose.<\/p>\n\n\n\n<p>&nbsp;J\u2019ai d\u2019abord test\u00e9 deux s\u00e9ries prises le m\u00eame soir et interrompues par un probl\u00e8me technique. Le centrage de l\u2019objet n\u2019\u00e9tait plus exactement le m\u00eame lors de la seconde tentative mais Pixinsight g\u00e8re \u00e7a tr\u00e8s bien. J\u2019ai ensuite travaill\u00e9 avec les images de deux soir\u00e9es cons\u00e9cutives. L\u00e0 l\u2019orientation de la cam\u00e9ra et le centrage \u00e9taient l\u00e9g\u00e8rement diff\u00e9rents. Cela n\u2019a pas pos\u00e9 de probl\u00e8me. J\u2019ai fini par utiliser la s\u00e9rie contenant un retournement au m\u00e9ridien, donc une partie avec des images retourn\u00e9es \u00e0 180 degr\u00e9s et l\u00e0 encore, aucun probl\u00e8me.<\/p>\n\n\n\n<p>Je suis donc par\u00e9 pour de plus longues sessions de photographie et l\u2019utilisation de filtres afin de composer mes images. Je vais donc photographier moins d\u2019objets et passer beaucoup plus de temps dehors. Il sans doute va falloir que j\u2019accepte de laisser le mat\u00e9riel travailler tout seul pendant que je dors un peu, car les soir\u00e9es d\u2019astronomie qui se finissent \u00e0 5h du matin, \u00e7a n\u2019est plus de mon \u00e2ge.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-1024x683.jpg\" alt=\"\" class=\"wp-image-11516\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-1024x683.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-300x200.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-768x512.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-1536x1024.jpg 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille-450x300.jpg 450w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2025\/05\/Laiguille.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Depuis que j\u2019ai d\u00e9but\u00e9 l\u2019astro photographie tout le monde me parle du retournement au m\u00e9ridien.  <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2025\/05\/14\/retournement-au-meridien\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":11515,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,3500,178,3499,3501],"class_list":["post-11514","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-monture-equatoriale","tag-photo","tag-retournement-au-meridien","tag-technique","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Retournement au m\u00e9ridien - Le Blog du N\u00e9oprog<\/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:\/\/www.blog.neoprog.eu\/index.php\/2025\/05\/14\/retournement-au-meridien\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Retournement au m\u00e9ridien - Le Blog du N\u00e9oprog\" \/>\n<meta property=\"og:description\" content=\"Depuis que j\u2019ai d\u00e9but\u00e9 l\u2019astro photographie tout le monde me parle du retournement au m\u00e9ridien. 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