Shapiro time delay | Wikipedia audio article
Channel: Shishir Kumar Sahu
Date: 20/11/2018

This is an audio version of the Wikipedia Article:
Shapiro time delay

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SUMMARY
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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. The time delay is caused by spacetime dilation, which increases the path length. In an article entitled Fourth Test of General Relativity, Shapiro wrote:

Because, according to the general theory, the speed of a light wave depends on the strength of the gravitational potential along its path, these time delays should thereby be increased by almost 2×10−4 sec when the radar pulses pass near the sun. Such a change, equivalent to 60 km in distance, could now be measured over the required path length to within about 5 to 10% with presently obtainable equipment.

Throughout this article discussing the time delay, Shapiro uses c as the speed of light and calculated the time delay of the passage of light waves or rays over finite coordinate distance according to a Schwarzschild solution to the Einstein field equations.