TIMELINE COMPARISON

L'Astrolabe et la sphère armillaire

Sphère armillaire

Astrolabe

Création

Philosophes grecs

Hipparque

Antiquité

315 de l’Hégire

Principe

Montrer le mouvement apparent des étoiles, soleil, et écliptique autour de la terre

Instrument de calcul

position étoiles/temps

Ensembles de cercles métaliques ou armilles représetant la géométrie des éléments descriptifs de la sphère céleste

disque -> astres -> projection

utilisation

determiner l'heure du jour: évenement céleste

origine

ἀστρολάβος : preneur d'astres

Armillaire < armilla qui signifie cercle ou bracelet

• La mère : disque principal sur lequel sont centrés les autres éléments
• L'alidade permet de viser les astres
• Le tympan : tracés de réseaux de lignes nécessaires au calcul de l'heure
• L'araignée : est la projection de la carte simplifiée du ciel
• La règle : permet l'alignement de points de l'araignée avec des repères sur la mère ou le tympan.

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