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Comment trouver l’étoile POLARIS?
Enpartantdesdeux"étoilesàindex"-lesdeuxétoilesàl'arrièredelagrandeOurse/
Grand Chariot - projetez cette distance cinq fois jusqu'à l'étoile polaire. Étendez cette
ligne bien au-delà du Polaris, puis atteignez les constellations de Pégase et d’Andromède.
Le triangle d’été représente une région du ciel bien identifiable à gauche du chariot de la
GrandeOurse,composédetroisétoilestrèsbrillantes:Vega,DenebetAtair.Cetriangle
secomposedetroisétoilestrèsbrillantes:Vega,DenebetAtair.
Si vous tracez une ligne imaginaire directement dans la direction de la queue (manche de
la casserole), vous arrivez à la constellation de l’été, Scorpion. Le scorpion se tord dans
lecielcommeunequeuedescorpionàgauche,elleressembleaussiunpeuàlalettre"J".
Les amateurs américains ont inventé le dicton "Arc to Arcturus et Spike to Spica", "Arc
d’Arcturus et Spike vers Spike". Ils se réfèrent à une région du ciel, qui se trouve dans le
prolongement direct de l’arc. Suivez l'arche jusqu'à l'Arcturus, l'étoile la plus brillante de
l'hémisphèrenord,puisdirigez-vousverslaSpica,la16eétoilelaplusbrillanteduciel.
Fig 36
i
ASTRO-Astuces !
Cartes stellaires
Les atlas stellaires et les cartes d'étoiles
rotatives sont des ustensiles extrêmement
utiles et utiles lorsqu'il s'agit de planifier
une nuit d'observation.
Il existe un grand nombre d'atlas d'étoiles
sous forme de livres, de revues, d'Internet
etdeCD-ROM.
Appendice
VIII
31


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