Galileo's magnifico measurement: 1976 redshift test updated | 12/7/2018 | Staff
malik778 (Posted by) Level 3
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Clocks on a pair of Galileo satellites have given physicists the first refinement of gravitational redshift since 1976.

The experiment was only possible because in 2014, a launch went ever-so-slightly wrong: two Galileo satellites known as Doresa and Milena were launched into elliptical orbits, rather than circular orbits.

Orbit - Axis - Degrees - Eccentricity - Team

The elliptical orbit had a semi-major axis of 26,200km inclined at 49.8 degrees – and that eccentricity gave a team of boffins from five countries an idea for an experiment - since the satellites' orbits take them in and out of Earth's gravity just a little, they should be able to measure how gravity affects time on the two birds.

Thus was born the ESA's GREAT experiment (Galileo's gravitational Redshift Experiment with eccentric sATellites – the ESA has an announcement here).

Physical - Society - Modulation - Redshift - Atomic

As the American Physical Society noted: "The resulting modulation of the gravitational redshift of the onboard atomic clocks allows the...
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