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LAGEOS satelliteNow 40, NASA's LAGEOS Set the Bar for Studies of EarthRelease Date: 05/04/2016 On May 4, 1976, NASA launched a cannonball-shaped satellite that transformed studies of Earth’s shape, rotation and gravity field.

LAGEOS – short for Laser Geodynamic Satellite – was the first NASA orbiter dedicated to the precision measurement technique called laser ranging. With it, scientists have measured the movement of Earth’s tectonic plates, detected irregularities in the rotation of the planet, weighed it, and tracked small shifts in its center of mass.

Small deviations in the satellite’s orbit were used to develop early models of Earth’s gravitational field. Further perturbations in the orbit helped explain how sunlight heating small objects can affect their orbits, including near-Earth asteroids.


galileo satelliteThe GREAT experimentRelease Date: 04/27/2016 The unplanned eccentric orbit of Galileo-201 and -202 provides a unique opportunity to study the behavior of on-board clocks and the gravitational redshift predicted by General Relativity. The Galileo-201 and -202 satellites, the first two Fully Operational Capability (FOC) satellites, were launched on August 22, 2014. Due to technical problems with the launch, these satellites remain in an elliptical orbit, which is not useful for the Galileo operations.

Colleagues with the Galileo mission have proposed a one-year, ESA funded experiment, GREAT (Galileo gravitational Redshift Experiment with eccentric sATellites) during which the SLR will provide periods of intensive tracking on Galileo-201. The GREAT experiment will begin May 1, 2016. The stations in the ILRS network are asked to support this experiment.

20th ILRS Workshop bannerThe 20th International Workshop on Laser RangingRelease Date: 03/21/2016 The 20th International Workshop on Laser Ranging will be held at the Helmholtz Centre Potsdam/GFZ German Research Centre for Geosciences in Potsdam Germany on October 09-14, 2016. More information, including registration and abstraction submission deadlines, is available on the workshop’s website: http://iwslr2016.gfz-potsdam.de/international-workshop-on-laser-ranging/

map of the worldNASA Contributes to Global Standard for Navigation, Studies of EarthRelease Date: 02/25/2016 The surface of Earth is constantly being reshaped by earthquakes, volcanic eruptions, landslides, floods, changes in sea levels and ice sheets, and other processes. Since some of these changes amount to only millimeters per year, scientists must make very precise measurements of the landscape and ocean in space and time in order to study their evolution and help mitigate their impacts.


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