Definition of "paracentrical"

Novv ſince the Planets move in Elliptick Orbits, in one of vvhoſe foci the Sun is, and by a Radius from the Sun deſcribe equal Area's in equal Times, vvhich no other Lavv of a Circulating Fluid, but the Harmonical Circulation can Account for, vve muſt find out a Lavv for the Paracentrical Motion, that may make the Orbits Elliptick.

1705, George Cheyne, “Of the Physical Laws, and the Uniform Appearances of Nature. Law III.”, in Philosophical Principles of Natural Religion: […], London: […] George Strahan […], § XXIV, page 39