heliostatic en · ADJ · etymology 1
Etymology
From helio- + -static.
Meanings
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(not-comparable) Of astronomical models of the solar system in which the Earth and planets move, but the Sun does not.
If heliostatic astronomy has no technical advantages, if thoroughly modern astronomy is not heliostatic, and if the arguments adduced by Copernicus were unconvincing, why were the early geostatic astronomies, Ptolemy's in particular, superseded?
1993, Hugh Thurston, Early Astronomy, Spriner-Verlag Ch 10, page 207: