Roman portable sundial. The artifact is in a bronze box with a medallion on the lid depicting Emperor Antoninus Pius (ruled from 138-161 CE).
Inside the box are 4 dials with diagrams – front and back – that adapted the dial for use at different latitudes. Light shone through a slot in the side wall, and the shadow of the indicator showed time on the scale.
The object is located at the KHM-Museumsverband in Vienna (Austria).
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