Definition of "geostatic"

In contrast, the moon, since it shares the earth's heliocentric motion, does not have a component of its geostatic motion that mirrors the earth's orbit and thereby yields retrogression, as does the epicycle of a superior planet.

1983, John Earman, Testing Scientific Theories, page 257

If we make a scale model in a flat box of a geostatic solar system , driven perhaps by an electric motor , place it on a smooth table , and hold the sun still, allowing the box to slide around on the table, we obtain a heliostatic system.

1996, Hugh Thurston, Early Astronomy, page 206