the Motions of the Stars, and Appearances in the Heavens are explained and demonſtrated in this than either in that of Ptolomy or Tycho. Let him conſider that Diſcovery of Kepler, that the Diſtances of the Planets from the Sun, as well of the Earth as the reſt, are in a fix’d certain proportion to the Times they ſpend in their Revolutions. Which Proportion it’s ſince obſerved that their Satellites keep round Jupiter and Saturn. Let him examine what a contradictory Motion they are fain to invent for the Solution of the Polar Star’s changing its Diſtance from the Pole. For that Star in the end of the little Bear’s Tail which now deſcribes ſo ſmall a Circle round the Pole, that it is not above two Degrees and twenty Minutes, was obſerved about 1820 Years ago, in the Time of Hipparchus, to be above 12: and will within a few Ages more be 45 Degrees diſtant from it: and after 25000 Years more will return to the ſame Place it is now in. Now if with them we allow the Heavens to be turned upon their own Axis, at this rate they muſt have a new Axis every Day: a Thing moſt abſurd, and repugnant to the Nature of all Motion. Whereas nothing is eaſier with Copernicus than to give us Satisfaction in this Matter. Then he may impartially weigh thoſe Anſwers that Galilæus, Gaſſendus, Kepler, and others have given to all Objections propoſed, which have ſo ſatisfied all Scruples, that generally all Aſtronomers now-a-days are brought over to our Side, and allow the Earth its Motion and Place among the Planets. If he cannot be ſatisfied with all this, he is either one whoſe Dulneſs can’t comprehend it, or who has his Belief at another Man’s Diſpoſal. In the other Figure you have the Globes of the Planets, and of the Sun, repreſented to your Eyes as placed near one another. Where [The Proportion of the Magnitude of the Planets, in reſpect of one another, and the Sun.] I have obſerved the ſame Proportion, of their Diameters to that of the Sun, that I publiſhed to the World in my Book of The Appearances of Saturn: namely, the Diameter of the Ring round Saturn is to that of the Sun as 11 as to 37; that of Saturn himſelf about as 5 to 37; that of Jupiter as 2 to 11; that of Mars as 1 to 166; of the Earth as 1 to 111; and of Venus as 1 to 84: to which I ſhall now add that of Mercury obſerved by Hevelius in the Year 1661, but calculated by my ſelf, and found to be as 1 to 290.