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BYZANTINE ASTROLABE

The astrolabe is one of the best known astronomical instruments used by the Arabs and Latins in the medieval Europe. Hipparhus, in the 2nd century B.C. was familiar with the underlying theory of stereographic projection on which the construction of the astrolabe is based. With an astrolabe we can calculate the height of stars, of sun we can measure angular distances, we can determinate the season the length of the day the rising and the setting of stars, etc. The replica in the photo is a Byzantine astrolabe made in 1026 A.D.