A sundial is a device that, when properly oriented, can indicate the time of day based on the direction sunlight is coming from at the time. It works by casting a shadow into a surface, usually marked with times.
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using a sundial
They refer to the time - in hours. The slanted edge of the gnomon casts a shadow on the sundial at the position which represents the time.
The sundial
sundial
A sundial is a device that measures time by the position of the Sun