Shapiro Delay
The Shapiro time delay effect, or gravitational time delay effect, is one of the four classic solar system tests of general relativity. Radar signals passing near a massive object take slightly longer to travel to a target and longer to return than they would if the mass of the object were not present.
Read more about Shapiro Delay: History, Calculating Time Delay, Interplanetary Probes, Shapiro Delay of Neutrinos and Gravitational Waves
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