## What Clocks are Used to Measure General Relativistic "Effects"?

Relativistic effects, which supposedly support General Relativity, are considered as small appendices added on to Newtonian motion. Eddington, in fact, describes Einstein's 'correction' to the elliptical orbit of Mercury by saying:

"the equation of the orbit in the usual form of particle dynamics. It differs from the Newtonian orbit by the small term, $3mu^2$ [$m$ is gravitational mass, $u$ is the inverse radius, in units where the speed of light is unity], which is easily shown to give the motion of the perihelion."