In geodesy and astrometry, earth orientation parameters (EOP) describe irregularities in the rotation of planet Earth.
EOP provide the rotational transform from the International Terrestrial Reference System (ITRS) to the International Celestial Reference System (ICRS), or vice versa, as a function of time.
Earth's rotational velocity is not constant over time. Any motion of mass in or on Earth causes a slowdown or speedup of the rotation speed, or a change of rotation axis. Small motions produce changes too small to be measured, but movements of very large mass, like sea currents, tides, or those resulting from earthquakes, can produce discernible changes in the rotation and can change very precise astronomical observations. Global simulations of atmosphere, ocean, and land dynamics are used to create effective angular momentum (EAM) functions that can be used to predict changes in EOP.[1]
^Dobslaw, Henryk; Dill, Robert (February 2018). "Predicting Earth orientation changes from global forecasts of atmosphere-hydrosphere dynamics". Advances in Space Research. 61 (4): 1047–1054. Bibcode:2018AdSpR..61.1047D. doi:10.1016/j.asr.2017.11.044.
and 24 Related for: Earth orientation parameters information
In geodesy and astrometry, earthorientationparameters (EOP) describe irregularities in the rotation of planet Earth. EOP provide the rotational transform...
global time and reference frame standards, notably through its EarthOrientationParameter (EOP) and International Celestial Reference System (ICRS) groups...
PZ-90.11 you will get January 2010 date). Earth-centered, Earth-fixed coordinate system Earthorientationparameters Geodetic datum International Celestial...
EOP may refer to: Earthorientationparameters Electroosmotic pump Emergency operations plan (US) European Opera-directing Prize Exchange Online Protection...
current version of WGS 84 uses EGM2008 and WMM2020. Solution for Earthorientationparameters consistent with ITRF2014 is also needed (IERS EOP 14C04). Components...
with numerous global collaborators (IERS), in order to produce Earthorientationparameters and to realize the celestial reference system (ICRF). Aside from...
redistribution of the solid earth, ocean, and atmosphere system determining Earthorientationparameters, such as Earth pole coordinates and length-of-day...
fraction of the Besselian year. World portal Airy mean time on Mars Earthorientationparameters List of international common standards Unix time Despite its...
is available from the International Earth Rotation and Reference Systems Service's Earthorientationparameters. Note in using this data that the convention...
System satellites to enable satellite navigation. Receivers on or near the Earth's surface can determine location, time, and velocity using this information...
the original on 2016-01-25. Retrieved 2015-10-17. "EarthOrientationParameters". International Earth Rotation and Reference Systems Service. Archived from...
March 2015. Retrieved 23 September 2008. "Rapid Service/Prediction of EarthOrientation". IERS Bulletin-A. 28 (15). 9 April 2015. Archived from the original...
Retrieved 12 July 2018. the low-Earth orbit (LEO) environment, defined as 200–1,000 km above Earth's surface "LEO parameters". www.spaceacademy.net.au. Archived...
determination of Earthorientationparameters including the daily and sub-daily polar motion, and length-of-day variabilities, Earth's center-of-mass -...
rotational or orbital parameters. An important example is the steady change in the orientation of the axis of rotation of the Earth, known as the precession...
the International Terrestrial Reference Frame (ITRF2008) and earthorientationparameters (EOP) systems. ICRF3 is the third major revision of the ICRF...
Other orbital parameters can be computed from the Keplerian elements such as the period, apoapsis, and periapsis. (When orbiting the Earth, the last two...
extremely accurate determinations of the Earth's center of mass and of its axis of revolution; and those parameters have been adopted also for all modern...
approximation see Pendulum in mechanics). GME, the gravitational parameter for the Earth as the central body, is called the geocentric gravitational constant...
particular, axial precession can refer to the gradual shift in the orientation of Earth's axis of rotation in a cycle of approximately 26,000 years. This...
the planet Earth, such as that of the Moon or of artificial satellites. Selenocentric orbit (named after Selene): An orbit around Earth's Moon. Areocentric...
for months on end. The apparent orientation of the Moon depends on its position in the sky and the hemisphere of the Earth from which it is being viewed...
Global Information