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sundial




sundial
A device for showing apparent solar time by the position of a shadow cast by an indicator called a gnomon. The gnomon slants upwards away from the dial at an angle determined by the latitude; it points due north in northern latitudes and due south in southern latitudes. Sundials were first used in the Near East about 5,000 years ago.


Related categories

   • TIME MEASUREMENT AND PUZZLES
   • HISTORY OF ASTRONOMY
   • SOLAR TOPICS