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→Fallacious Claims of Experimental Verification of Relativity: Make picture caption say what is going on.
General relativity predicts this extra precession, in the amount of <math>3 v^2/c^2</math> revolutions per planet's "year", where <math>v</math> is the planet's average orbital speed. There is some controversy over whether general relativity's results are really accurate in terms of modern observations.
General relativity predicts this extra precession, in the amount of <math>3 v^2/c^2</math> revolutions per planet's "year", where <math>v</math> is the planet's average orbital speed. There is some controversy over whether general relativity's results are really accurate in terms of modern observations.
[[Image:Cassini-science-289.jpg|right|thumb|signal dipping into a gravity well around the [[sun]]]]
[[Image:Cassini-science-289.jpg|right|thumb|The Shapiro effect: A signal dipping into a gravity well around the [[sun]] is delayed slightly]]
As the 20<sup>th</sup> century progressed, more tests of general relativity were proposed. One was the ''Shapiro effect'', involving time delay in radio signals passing through the gravity well of a planet. Various spacecraft have confirmed this.
As the 20<sup>th</sup> century progressed, more tests of general relativity were proposed. One was the ''Shapiro effect'', involving time delay in radio signals passing through the gravity well of a planet. Various spacecraft have confirmed this.