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— Mobile Sun-Dials: Compass Sun-Dial Type 2 —

These instruments measure the hour angle. They were used by the sailors in the time of discoveries. It is quite simple to use. The dial must be hold horizontally and with the help of the compass, aligned to north. The shadow from the pointer shows the True Local Time.

Compass 2
 
  © 2004 - 2017 by Horo Wernli.