Vikings, Normands, Carolingiens... aux passionnés de l'histoireForum d'amateurs de la reconstitution historique
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Frank Sigvaldson
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Joined: 23 Dec 2010
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 Posted: Wed 22 Apr 2015 - 19:09 Post subject: Les Vikings naviguaient de nuit grâce au soleil ! |
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Grâce à un compas solaire et à des cristaux, des chercheurs ont démontré la possibilité d'identifier la position du soleil de nuit, quel que soit l'heure.
| Quote: | | The sun compass fragment, prior research has suggested, operated in similar fashion to a sundial, using the position of the sun to determine direction, instead of time. Some have suggested the Vikings also used a dome shaped object with slits in it, placed on top of the compass to help narrow the light during the time when the sun moved low towards the horizon. The researchers in Hungary are now suggesting that they also added calcite stone crystals for use after the sun went below the horizon. They've conducted tests which show that the crystals can be used to note where the sun is after it's passed below the horizon, because they direct ultraviolet light into patterns inside the stone, which can be seen by the human eye. If such stones were used, the Vikings could have used them all night long in the northern latitudes as it never goes completely dark. |
http://phys.org/news/2014-03-vikings-crystals-sun-compass-night.html |
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| Posted: Today at 14:28 Post subject: Les Vikings naviguaient de nuit grâce au soleil ! |
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