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The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconciliation of a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with uniform motion along the celestial equator. Apparent solar ...
While the future cannot be predicted with certainty, present understanding in various scientific fields allows for the prediction of some far-future events, if only in the broadest outline. [1][2][3][4]These fields include astrophysics, which studies how planetsand starsform, interact, and die; particle physics, which has revealed how matter behaves at the smallest scales; evolutionary biology ...
Caesium atomic clocks are one of the most accurate time and frequency standards, and serve as the primary standard for the definition of the second in the International System of Units (SI), the modern metric system. By definition, radiation produced by the transition between the two hyperfine ground states of caesium-133 (in the absence of external influences such as the Earth's magnetic ...
Earth's polar circumference is very near to 21,600 nautical miles because the nautical mile was intended to express one minute of latitude (see meridian arc ), which is 21,600 partitions of the polar circumference (that is 60 minutes × 360 degrees).
Hindu units of time are described in Hindu texts ranging from microseconds to trillions of years, including cycles of cosmic time that repeat general events in Hindu cosmology.
t. e. The speed of lightin vacuum, commonly denoted c, is a universal physical constantthat is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
This is a list of recessions (and depressions) that have affected the economy of the United Kingdom and its predecessor states. In the United Kingdom a recession is generally defined as two successive quarters of negative economic growth, as measured by the seasonally adjusted quarter-on-quarter figures for real GDP. [1] [2]
On 20 September 2015, a Touareg V6 TDI driven by Rainer Zietlow, Marius Biela, and Sam Roach completed the run of 19,000 km from Cape Agulhas, the southernmost point of Africa, to the North Cape (Nordkapp) of Norway in a world record time of 9 days, 4 hours, 9 minutes and 27 seconds.