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History of timekeeping devices

Mechanical Clocks

1920'

1794

Ancient Persian clock.Kariz.zibad

Shadow Clocks

Incense clocks

The oldest known sundial is from Egypt, it dates back to around 1500 BC .Ancient Egyptian obelisks, constructed about 3500 BC, are also among the earliest shadow clocks.

In addition to water, mechanical, and candle clocks, incense clocks were used in the Far East, and were fashioned in several different forms.

Candle clocks

Water clocks

Sundials

The earliest mention of candle clocks comes from a Chinese poem, written in 520 by You Jianfu. According to the poem, the graduated candle was a means of determining time at night. Similar candles were used in Japan until the early 10th century.

Water clocks, or clepsydrae, were commonly used in Ancient Greece following their introduction by Plato, who also invented a water-based alarm clock.

Ctesibius's clepsydra from the 3rd century BC. Clepsydra, literally water thief, is the Greek word for water clock

Astronomical Clock

A 20th-century sundial in Seville, Andalusia, Spain

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