Question

what is common about all time-keeping devices?​

Answer 1

Answer:

sundial

First used in Mesopotamia in c. 3500 BC, the time stick – a primitive form of sundial – was the first “clock” ever developed by Man. Consisting simply of a long stick planted in the earth, it told the time by casting a shadow on the ground that changed length and position as the Sun “moved” overhead.

Explanation:

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