sundials
Sundials are timekeeping devices that use the position of the sun to indicate the time of day, typically consisting of a flat plate or an object with a gnomon (protruding pointer) casting a shadow onto a calibrated surface.
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Sundials are timekeeping devices that use the position of the sun to indicate the time of day, typically consisting of a flat plate or an object with a gnomon (protruding pointer) casting a shadow onto a calibrated surface.
Requires login.