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The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture. Archeologists have reconstructed methods of timekeeping that go back to ...
Gregorian calendar. The Gregorian calendar is the calendar used in most parts of the world. [1][a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years ...
The adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various traditional (or "old style") dating systems to the contemporary (or "new style") system – the Gregorian calendar – which is widely used around the world today. Some states adopted the ...
A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [ 1 ][ 2 ][ 3 ] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.
The invention of the verge and foliot escapement in c.1275 [87] was one of the most important inventions in both the history of the clock [88] and the history of technology. [89] It was the first type of regulator in horology. [6] A verge, or vertical shaft, is forced to rotate by a weight-driven crown wheel, but is stopped from rotating freely ...
Aryabhata ( ISO: Āryabhaṭa) or Aryabhata I[3][4] (476–550 CE) [5][6] was the first of the major mathematician - astronomers from the classical age of Indian mathematics and Indian astronomy. His works include the Āryabhaṭīya (which mentions that in 3600 Kali Yuga, 499 CE, he was 23 years old) [7] and the Arya- siddhanta.
The book of hours has its ultimate origin in the Psalter, which monks and nuns were required to recite. By the 12th century this had developed into the breviary, with weekly cycles of psalms, prayers, hymns, antiphons, and readings which changed with the liturgical season. [8]
1886: Charles Martin Hall and independently Paul Héroult invent the Hall–Héroult process for economically producing aluminum in 1886. 1886: Karl Benz invents the first petrol or gasoline powered auto-mobile (car). [ 440 ] 1887: Carl Josef Bayer invents the Bayer process for the production of alumina.