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— Mobile Sun-Dials: Farmer's Ring —

This instrument measures the height of the sun. It was invented in by the monks from the Prussian woods in the 13th century. The months are engraved on the outer edge of the ring, the time on the inner one. A small hole must be aligned with the appropriate month, then turned into the sun. In the shadow of the inner part of the ring, a small bright spot of light shows the True Local Time.

Ring
 
  © 2004 - 2017 by Horo Wernli.