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A large variety of devices have been invented to measure time. The study of these devices is called horology. The position of the shadow marks the hour in local time. The idea to separate the day into smaller parts is credited to Egyptians because of their sundials, which operated on a duodecimal system.
Hipparchus, whose work primarily took place between 147 and 127 B.C., proposed dividing the day into 24 equinoctial hours, based on the 12 hours of daylight and 12 hours of darkness observed on equinox days. Despite this suggestion, laypeople continued to use seasonally varying hours for many centuries.
Great advances in accurate time-keeping were made by Galileo Galilei and especially Christian Huygens with the invention of pendulum driven clocks along with the invention of the minute hand by Most Burgh.
Time is represented through change, such as the circular motion of the moon around Earth. The passing of time is indeed closely connected to the concept of space. According to the general theory of relativity, space, or the universe, emerged in the Big Bang some 13.7 billion years ago.
While in theory, the concept of a single worldwide universal time-scale may have been conceived of many centuries ago, in practicality the technical ability to create and maintain such a time-scale did not become possible until the mid-19th century. The timescale adopted was Greenwich Mean Time, created in 1847.
Time was not discovered, it was invented. Time is a measurement, just like meters or kilograms. We use time to measure the speed of things or how long it takes from getting from point A to point B. We can measure time in nanoseconds, milliseconds, seconds, minutes, hours, and so on.
THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.
Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Bomb. “Night-time was divided in 12 hours, based on the observations of stars.

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