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Pourtant, d&amp;#233;finir un syst&amp;#232;me de r&amp;#233;f&amp;#233;rence n’est pas une t&amp;#226;che simple, car elle est reli&amp;#233;e au
concept de mouvement relatif et de syst&amp;#232;me de r&amp;#233;f&amp;#233;rence inertiel.
Ce sc&amp;#233;nario a pour but de fournir une premi&amp;#232;re initiation bas&amp;#233;e sur les mouvements d’&amp;#233;toiles
dans la ceinture de Gould. Ceci est &amp;#233;galement en lien avec les missions scientifiques de GAIA,
mission de l’Agence Europ&amp;#233;enne Spatiale (ESA).</langstring><langstring xml:lang=""/></description><keyword><langstring xml:lang="fr">demonstrator</langstring><langstring xml:lang="fr"> astrometrie</langstring><langstring xml:lang="fr"> systeme de reference</langstring><langstring xml:lang="fr"> etoiles</langstring><langstring xml:lang="fr"> cinematique</langstring></keyword></general><lifecycle><status><source>LOM v1.0</source><value>final</value></status><version><langstring xml:lang="en">1.0</langstring></version><contribute><role><source>LOM v1.0</source><value>author</value></role><date><datetime>2012-09-27</datetime><description/></date><centity><vcard/></centity></contribute><contribute><role><source>LOM v1.0</source><value>publisher</value></role><date><datetime>2012-09-27</datetime><description/></date><centity><vcard/></centity></contribute></lifecycle><metametadata><language>fr</language><metadatascheme>LOM v1.0</metadatascheme><contribute><role><source>LOM v1.0</source><value>creator</value></role><date><datetime>2012-09-27</datetime><description/></date><centity><vcard/></centity></contribute><contribute><role><source>LOM v1.0</source><value>validator</value></role><date><datetime/><description/></date><centity><vcard/></centity></contribute></metametadata><technical><duration><datetime/><description/></duration><requirement><type><source>LOM v1.0</source><value>browser</value></type><name><source>LOM v1.0</source><value>any</value></name><minimumversion/><maximumversion/></requirement><requirement><type><source>LOM v1.0</source><value>os</value></type><name><source>LOM v1.0</source><value>any</value></name><minimumversion/><maximumversion/></requirement><installationremarks/><otherplatformrequirements/><size></size><format>text/html</format><location>http://portal.discoverthecosmos.eu/node/187678</location></technical><rights><cost><source>LOM v1.0</source><value>no</value></cost><copyrightandotherrestrictions><source>LOM v1.0</source><value>no</value></copyrightandotherrestrictions><description/></rights><educational><interactivitytype><source>LOM v1.0</source><value>active</value></interactivitytype><interactivitylevel><source>LOM v1.0</source><value>high</value></interactivitylevel><semanticdensity><source/><value/></semanticdensity><difficulty><source>LOM v1.0</source><value>medium</value></difficulty><learningresourcetype><source>LOM v1.0</source><value>exercise</value></learningresourcetype><learningresourcetype><source>LOM v1.0</source><value>narrative text</value></learningresourcetype><learningresourcetype><source>LOM v1.0</source><value>Inquiry-Based Teaching</value></learningresourcetype><context><source>LOM v1.0</source><value>2 didactic hours</value></context><typicalagerange><langstring xml:lang="en">12-15</langstring><langstring xml:lang="en">15-18</langstring><langstring xml:lang="en">18-25</langstring></typicalagerange></educational><classification><purpose><source>LOM v1.0</source><value>Discipline</value></purpose><taxonpath><source><langstring xml:lang="en">Science</langstring></source><taxon><id/><entry><langstring xml:lang="en">Astronomy: Astrometry</langstring><langstring xml:lang="en">Astronomy: Comets and meteors</langstring><langstring xml:lang="en">Astronomy: Coordinates</langstring><langstring xml:lang="en">Astronomy: Kuiper belt objects</langstring><langstring xml:lang="en">Astronomy: Milky Way</langstring><langstring xml:lang="en">Astronomy: Orbit</langstring><langstring xml:lang="en">Astronomy: Solar system</langstring><langstring xml:lang="en">Astronomy: Sun</langstring><langstring xml:lang="en">Astronomy: Variable stars</langstring></entry></taxon></taxonpath><description/></classification></lom>
