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Encyclopedia > DUT1

This graph shows the historical evolution of DUT1 between 1985 and 2005. The vertical segments are due to leap seconds. Smaller upward kinks are due to earthquakes. Image File history File links Leapsecond. ...


The time correction DUT1 is the difference between the Universal Time scale UT1 (which corresponds to the Earth's rotation) and the Coordinated Universal Time (UTC) (which corresponds, except for a constant offset, to International Atomic Time (TAI)). Universal Time (UT) is a timescale based on the rotation of the Earth. ... Earth is the third planet in the solar system. ... Rotation of a plane, seen as the rotation of the terrain relative to the plane (exposure time 1. ... It has been suggested that leap second be merged into this article or section. ... International Atomic Time (TAI, from the French name Temps Atomique International) is a high-precision atomic time standard that tracks proper time on Earths geoid. ...

DUT1 = UT1 - UTC

DUT1 is maintained in the range -0.9 s < DUT1 < +0.9 s by introducing a leap second into UTC roughly every 18 months. Forecast values of DUT1 are published in IERS Bulletin A. A leap second is a one-second adjustment to civil time in order to keep it close to the mean solar time. ... The International Earth Rotation Service (IERS) is the body responsible for maintaining global time and reference frame standards, notably through its Earth Orientation Paramater (EOP) and International Celestial Reference System (ICRS) groups. ...


The reason for this correction is that the rate of rotation of the Earth is not constant, due to tidal braking and small effects from earthquakes. A separate article treats the phenomenon of tidal resonance in oceanography. ... Global earthquake epicenters, 1963–1998 An earthquake is a sudden and sometimes catastrophic movement of a part of the Earths crust. ...


  Results from FactBites:
 
DUT1 - Wikipedia, the free encyclopedia (128 words)
DUT1 is maintained in the range -0.9 s < DUT1 < +0.9 s by introducing a leap second into UTC roughly every 18 months.
Forecast values of DUT1 are published in IERS Bulletin A.
The reason for this correction is that the rate of rotation of the Earth is not constant, due to tidal braking and small effects from earthquakes.
Demise of Leap Seconds (1130 words)
A DUT1 of 0.9 s is small enough that it is not relevant to many telescopes that predate the digital age.
A DUT1 of 0.9 s is large enough that it is important to telescopes that perform automated target acquisition.
Values of DUT1 will undoubtedly remain available from the IERS over the Internet, but the current forms require text files to be retrieved at regular intervals and then interpreted.
  More results at FactBites »

 
 

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