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ORCHIDS The International School

Sundial Clock

From ancient times, sundials have been used as a timekeeping device. It helps to indicate the time of the day by the position of the shadow of some object exposed to the direct sun rays.

As the day progresses, the sun moves across the sky, which causes that object’s shadow to move and indicates the passing of time.

The first well-known sundial used was Gnomon, used from about 3500 BCE. It consisted of a vertical stick-like pillar, and the length of the pillar’s shadow helps to indicate the time of the day. The earliest known sundial preserved is the Egyptian shadow clock. This clock consists of a plane base with a raised crosspiece at one end. The shadow of this cross piece on this base indicates the time. The base is inscribed with six scales of time divisions.

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