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International Earth Rotation and Reference Systems Service

Glossary


The following terms are related to the IERS and to Earth rotation and reference systems in general. 
Additions will follow, proposals are welcome.

site displacements

time-varying changes in the coordinates of a terrestrial site due to local deformations.


Source: IERS Technical Note 36: Glossary (PDF, 244KB, Not barrier-free file.) of the IERS Conventions (2010)

SLR

SLR (Satellite Laser Ranging) measures the time intervals required for pulses emitted by a laser transmitter to travel to a satellite and return to the transmitting site. The "range", or distance between the satellite and the observing site, is approximately equal to one half of the two-way travel time multiplied by the speed of light.


Source: IERS Technical Note 36: Glossary (PDF, 244KB, Not barrier-free file.) of the IERS Conventions (2010)

stellar angle