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Volvelle from BL Sloane 702, ff. 21v-22

A volvelle, a device with a moveable disc rotating with a fixed matrix, with a pointing moveable index of the sun (here painted yellow to represent the sun) which could be set at the sign and degree of the zodiac for a particular day in order to predict the best time to provide medical treatment. The names of the months are on the inside ring, with degrees and corresponding zodiac names below, o…