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Ancient Egyptian sundial (c. 1500 BC), from the Valley of the Kings, used for measuring work hour. Daytime divided into 12 parts. The ancient Egyptians were one of the first cultures to widely divide days into generally agreed-upon equal parts, using early timekeeping devices such as sundials, shadow clocks, and merkhets (plumb-lines used by early astronomers).
History of timekeeping devices in Egypt; Quantum metrology – Application of quantum entanglement to high-precision measurement; Quartz crisis – 1970s–80s watchmaking industry upheaval; Seconds pendulum – Pendulum whose period is precisely two seconds; Smart Metrology – Approach to industrial metrology
A merkhet (Science Museum, London)The merkhet or merjet (Ancient Egyptian: mrḫt, 'instrument of knowing' [1]) was an ancient surveying and timekeeping instrument. It involved the use of a bar with a plumb line, attached to a wooden handle. [2]
The history of Egypt has been long and wealthy, due to the flow of the Nile River with its fertile banks and delta, as well as the accomplishments of Egypt's native inhabitants and outside influence. Much of Egypt's ancient history was unknown until Egyptian hieroglyphs were deciphered with the discovery and deciphering of the Rosetta Stone .
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This timeline of time measurement inventions is a chronological list of particularly important or significant technological inventions relating to timekeeping devices and their inventors, where known. Note: Dates for inventions are often controversial. Sometimes inventions are invented by several inventors around the same time, or may be ...
A fact from History of timekeeping devices in Egypt appeared on Wikipedia's Main Page in the Did you know column on 9 April 2008, and was viewed approximately 1,222 times (check views).
A sundial uses local time. Before the coming of the railways in the 1840s, local time was displayed on a sundial and was used by the government and commerce. Before the invention of the clock the sundial was the only way to measure time. After the invention of the clock, the sundial maintained its importance, as clocks needed to be reset ...