Post-Keplerian parameter
In Astronomy, the term of Keplerian parameter post refers to an observable quantity which makes it possible to describe the orbit of two celestial bodies one around the other by taking account of these corrections predicted by the General relativity with the movement known as Keplerian predicts by the Universal gravitation. In practice, the parameters post-Keplerian are measurable only in the Solar system (for example with the Précession of the perihelion of Mercure) and in the very tight binary systems in orbit, as in the binary pulsars.
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