How early humans without any watch used to plan their day\schedule?
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Looking at the sun
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Early clocks were normally in churches and they were very heavy because they were worked by weights. However about 1450 the coiled spring was invented and it made possible portable clocks. The first watches were made in 1510. In the 16th century some rich people had clocks in their homes but they were very expensive.
There was another more advanced shadow clock or sundial in use by the ancient Egyptians around 1500 BC. 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. The water clock was used by the ancient Greeks.
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