heliocentricism

Etymology
< from Greek ηλιοκεντρικός (heliokentrikos) "having the sun as his centre", from ancient Greek ήλιος (helios) "sun" + κέντρον (kentron) "centre".

Noun

 * 1) * 1869, William Howard Ward, editor, Review of “l’Abbé D. Bouix, La Condamnation de Galilée” in “Notices of Books” in The Dublin Review Volume 64, 224:
 * And as to Copernicus, he declared most expressly in his preface that he spoke of Heliocentricism as a pure hypothesis; the imagination of which was useful for the calculation of planetary orbits, but which “need not be true or even probable,” i.e., resting on any solid ground whatever.
 * 1) * 1907, Gerald Cator, “The Structure of Reality” in Mind: A Quarterly Review of Psychology and Philosophy Volume 16, ed. G. F. Stout, 58
 * I do not say for example that Heliocentricism is no truer than Geocentricism, but is only a simpler hypothesis.
 * I do not say for example that Heliocentricism is no truer than Geocentricism, but is only a simpler hypothesis.

Usage notes
This is the form recognized by many dictionaries as grammatically correct. However, in current usage "heliocentrism" appears to be by far more frequently used. According to a Google Books search it seems that "heliocentrism" began to gain ground in the turn of 1960s and 1970s with the first occurrence taking place in 1930s.