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<lom:string language="fre">&lt;p&gt;L'astronome observe essentiellement des angles sur un ciel que l'on appelle la sphère céleste. Pourtant, tous les astres ne sont pas à la même distance de l'observateur. La Terre paraît plate et immobile. Comment, à partir de simples mesures d'angles, va-t-on pouvoir mesurer la taille de la Terre, la distance qui la sépare des astres du ciel et son mouvement dans l'espace? Comment va-t-on en déduire toutes les autres distances dans le système solaire et dans l'Univers ?&lt;/p&gt;</lom:string>
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