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71.8 MB (5.9 MB compressed)
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42.4 x 42.4 cm ⏐ 16.7 x 16.7 in (300dpi)
TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Sundial. This time-keeping instrument indicates the time of day by means of a shadow cast on its surface, which is marked with hours. The shadow- casting marker is known as the gnomon. Tables are used to calculate standard time from the solar time that varies throughout the year.
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