File:Perseus.gif

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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

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	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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• La projection utilisée est une projection centrale (qui préserve les alignements). L'échelle est choisie pour que la "distance" du centre au bord du carré soit ~ 25°. La représentation paraît échelle 1/5 pour une distance de lecture normale.
• Les positions stellaires et les magnitudes viennent du catalogue d'étoiles de Yale.
• Les tracés des constellations sont souvent (pas toujours) inspirés de "The Stars - A new way to see them", H.A. Rey, 1952-1980, ISBN 0-395-24830-2.

Cette animation vise à contourner le problème que représente pour la reconnaissance des constellation la très grande différence de visibilité des étoiles, fonction de leur magnitude et des conditions d'observation. Le carré correspond au champ de vision d'un observateur standard. L'impression visuelle est celle que l'on peut avoir au cours d'une nuit étoilée.

Micheletb 19:11, 24 August 2006 (UTC)

(courtesy translation for linguistic impaired readers ;o)

• Central projection used (preserves star alignements). Scale: From square center to edge ~ 25°. This picture seems scaled ~1/5 for a normal reading distance.
• Star positions and magnitudes are taken from the Yale star catalog.
• Constellation drawings (often but not always) following "The Stars - A new way to see them", H.A. Rey, 1952-1980, ISBN 0-395-24830-2.

This animation is ment to compensate for the wide differences in star visibilities according to magnitude and visibility conditions, and its impact on constellation pattern recognition. The square corresponds to the field vision of a standard observator. The visual rendering is that of a starry night.