Portal:Time
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 Time is a fundamental component of our measuring system and has long been a major subject of art, philosophy, and science. In physics and other sciences, time is considered a fundamental quantity; part of the basic structure of the universe, a dimension in which events occur in sequence. The unit of time in the International System of Units (SI) is the second...
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 The history of timekeeping devices encompasses the various methods used to measure time throughout history. The origins of the current Western time measurement system date to approximately 2000 BC, in Sumer. The system developed then—which remains in use today—was sexagesimal. The Ancient Egyptians classified day and night as each being twelve hours long... Water clocks, called clepsydras by the Greeks, were also of early Egyptian design, probably first used in the Precinct of Amun-Re; their use continued, especially in Greece. Around this period, the Chinese, ruled by the Shang dynasty, are thought to have used the outflow water clock, which was introduced from Mesopotamia as early as 2000 BC. Other ancient timekeeping devices include the candle clock, used in China, Japan, and England; the timestick, used in India and Tibet, as well as some parts of Europe; and hourglasses, which functioned similarly to a water clock.
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 Bede (also Saint Bede, the Venerable Bede, or (from Latin) Beda) (c. 672 or 673 – May 25, 735), was a Benedictine monk... He is well known as an author and scholar, and his most famous work, Historia ecclesiastica gentis Anglorum (The Ecclesiastical History of the English People) gained him the title "The father of English history"... His work On the Reckoning of Time (De temporum ratione) included an introduction to the traditional ancient and medieval view of the cosmos, including an explanation of how the spherical earth influenced the changing length of daylight, of how the seasonal motion of the Sun and Moon influenced the changing appearance of the New Moon at evening twilight, and a quantitative relation between the changes of the Tides at a given place and the daily motion of the moon.
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...that the second was known as a "second minute", the second small division of an hour. ...that the second is defined as the duration of 9,192,631,770 oscillations between the two hyperfine levels of the ground state in the Cesium-133 atom. ...that the smallest unit of time that could ever be measured is the Planck time (~ 5.4 × 10−44 seconds). ..that despite Herodotus's claim that the sundial was invented in Babylon, the oldest known example is from Egypt? ... that merkhets were Ancient Egyptian timekeeping devices that tracked the movement of certain stars over the meridian in order to ascertain the time during the night, when sundials could not function?
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