Question

before the invention of water clock, sand clock and sundial how do people used to know about the time ?

Answer 1

Answer:

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These obelisks were believed to have been constructed around 3500 BC and a shadow would be cast by the obelisk as the sun made it's way across the sky. ... This shadow clock or sundial permitted one to measure the passage of hours within a day. Another very early form of clock to tell the time was the water clock.