File:Navisphere2.jpg

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Français : Deuxième photographie d'un navisphère, instrument destiné à la préparation d'une observation astronomique (une observation "astro" consiste à mesurer la hauteur angulaire d'un astre au-dessus de l'horizon)en vue de calculer un point astronomique (latitude, longitude). La durée pendant laquelle on peut observer à la fois l'horizon et les astres est très courte (4 à 5 minutes) lors de l'aube et du crépuscule. Aussi, il convient de savoir où les astres que l'on va observer se situent dans le ciel. Le navisphère sert à cela, on le cale à l'aide de la date d'observation et de données issues des "éphémérides nautiques" ou "connaissance des temps". J'ai fait la photographie et je suis le propriétaire du navisphère.
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(Reusing this file)		 Released under the GNU Free Documentation License.
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Originally from fr.wikipedia; description page is (was) here

  • 7 juin 2006 à 17:53 Chevassu 417×629 (19 930 octets) (Deuxième photographie d'un navisphère, instrument destiné à la préparation d'une observation astronomique (une observation "astro" consiste à mesurer la hauteur angulaire d'un astre au-dessus de l'horizon)en vue de calculer un point astronomique (la)
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current10:40, 4 November 2006Thumbnail for version as of 10:40, 4 November 2006417 × 629 (19 KB)Korrigan (talk | contribs){{Information| |Description= Deuxième photographie d'un navisphère, instrument destiné à la préparation d'une observation astronomique (une observation "astro" consiste à mesurer la hauteur angulaire d'un astre au-dessus de l'horizon)en vue de calcu

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