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An Attempt to Prove the Motion of the Earth by Observations
(Continued)

On the other side, some out of a contradicting nature to their Tutors; others, by as great a prejudice of institution; and some few others upon better reasoned grounds, from the proportion and harmony of the World, cannot but imbrace the Copernican Arguments, as demonstrations that the Earth moves, and that the Sun and Stars stand still. I confess there is somewhat of reason on both sides, but there is also something of prejudice even on that side that seems the most rational.

For by way of objection, what way of demonstration have we that the frame and constitution of the World is so harmonious according to our notion of its harmony, as we suppose? Is there not a possibility that the things may be otherwise? nay, is there not something of probability? may not the Sun move as Ticho supposes, and the Planets make their Revolutions about it whilst the Earth stands still, and by its magnetism attracts the Sun, and so keeps him moving about it, whilst at the same time and move about the Sun, after the same manner as and move about the Sun whilst the Satellites move about them? especially since it is not demonstrated without much art and difficulty, and taking many things for granted which are hard to be proved, that there is any body in the Universe more considerable then the Earth we tread on.

Is there not much reason for the Hypothesis o f Ticho at least, when he with all the accurateness that he arrived to with his vast Instruments, or Riccioli, who pretends much to out-strip him, were not able to find any sensible Parallax of the Earths Orb among the fixt Stars, especially if the observations upon which they ground their assertions, were made to the accurateness of some few Seconds? What then, though we have a Chimera or Idea of perfection and harmony in that Hypothesis we pitch upon, may there not be a much greater harmony and proportion in the constitution it self which we know not, though it be quite differing from what we fancy?

 Probable Arguments might thus have been urged both on the one and the other side to the Worlds end; but there never was nor could have been any determination of the Controversie, without some positive observation for determining whether there were a Parallax or no of the Orb of the Earth; This Ticho and Riccioli affirm in the Negative, that there is none at all: But I do affirm there is no one that can either prove that there is, or that there is not any Parallax of that Orb amongst the fixt Stars from the Suppellex of observations yet made either by Ticho, Riccioli, or any other Writer that I have yet met with from the beginning of writing to this day.

For all Observators having hitherto made use of the naked eye for determining the exact place of the object, and the eye being unable to distinguish any angle less then a minute, and an observation requisite to determine this requiring a much greater exactness then to a minute, it doth necessarily follow that this experimentum crucis was not in their power, whatever either Ticho or Riccioli have said to the contrary, and would thence overthrow the Copernican System, and establish their own. We are not therefore who lly to acquiess in their determination, since if we examine more nicely into the observations made by them, together with their Instruments and wayes of using them, we shall find that their performances thereby were far otherwise then what they would seem to make us believe.

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