L’anneau astronomique de Philippes est un cadran solaire portable de hauteur de petites dimensions qui est utilisable pour quatre lieux (Vienne, Rome, Rhodes, Alexandrie). Daté du début du IVe siècle de notre ère, c’est le seul exemplaire connu de ce type, à l’heure actuelle, datant de l’Antiquité. Alors que l’on croyait jusque dans les années 1980 que ce type d’instrument avait été inventé à l’extrême fin du Moyen âge ou au tout début de la Renaissance, sa découverte a confirmé que les cadrans portables antiques, dont l’ensemble du corpus représente aujourd’hui une trentaine d’exemplaires, sont très élaborés. On se propose ici pour la première fois d’étudier le fonctionnement de cet anneau astronomique et d’estimer sa précision. The astronomical ring of Philippi is a small portable altitude-based sundial that can be used for four locations (Vienna, Rome, Rhodes, Alexandria). Dated at the beginning of the 4th century AD, it is the only sample of this type known at present dating from Antiquity. While it was believed until the 1980s that this type of instrument had been invented at the very end of the Middle Ages or at the very beginning of the Renaissance, its discovery confirmed that ancient portable sundials, which the whole corpus today represents about thirty samples, are very elaborated. We propose here for the first time to study the operation of this astronomical ring and to estimate its precision.
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