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Sundial

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Sundials are "those instruments, either fixed or portable, which determine the divisions of the day (Latin: dies) by the motion of the shadow of some object on which the sun's rays fall. It must have been one of the earliest applications of a knowledge of the apparent motion of the sun; though for a long time men would probably be satisfied with the division into morning and afternoon as marked by sun-rise, sun-set and the greates elevation."[1]

References

  1. ↑ Encylopædia Britannica, 11th edition, 1911