'Tis true, fuch Perfons may pretend, that tho' thefe Phænomena be undoubted; and would be the undoubted Effects of fuch a Motion; yet that this Annual Revolution is not the undeniable, the ftrictly Geometrical Confequence of them; that they may poffibly be accounted for on other Hypothefes, and that on the Suppofition of certain complex Motions, deriv'd from (imaginary) Epicycles, and Eccentricks, and folid Orbs, &c. they may be folved without the introduction of this Annual Motion of the Earth. Now this I do not abfolutely deny, that if fuch precarious, aukward, immechanical, falfe, and abfurd Figments, were the true and real Laws of Nature, thefe Phænomena might poffibly be otherwife accounted for: But then I affirm, that fuch Hypothefes are indeed not at all the real Laws of Nature, but no better than meer precarious, aukward, immechanical, falfe, and abfurd Figments only; fuch indeed, as if they were allow'd in other Cafes, would take away all Certainty in all mixt Mathematicks at least, if not in Arithmetick and Geometry themselves; and would enable Men to evade the grand Foundation of Aftronomy, I mean that of the common Parallax it felf: Thefe Phænomena being as truly Inftances of an Annual, as other known ones are of the Diurnal Parallax. I believe the skilful Aftronomers will know my meaning by this general intimation; but if not, I will eafily undertake to demonftrate, that those who, notwithstanding thefe Indications, or Demonftrations, do deny or doubt of the Earth's Annual Motion, may, in Confequence thereof, become Aftronomical Scepticks, and deny, or doubt of almost all the other Principles of Aftronomy,