1. Their Bulk, which in all probability, is not in any of them lefs than our Earth, as the moft ingenious Mr. Huygens concludes (b) from their Shade upon Jupiter's Disk. By which partly it is that, 2. They reflect so strong, brisk, and vivid a Light, as appears very illuftrious, and entertaining, even to us at fo great a Distance from it: Which cannot but be very pleafing and comfortable to that Planet: Befides the no lefs beneficial and friendly Influences conveyed therewith at the fame Time. and 3. Their due Distances from Jupiter, and from one another; their agreeable periodick Revolutions, which I have formerly obferved (d) to be in the most exact mathematical Proportions. By the first (b) Cofmotheor. p. 101. of thefe, thofe Satellites efcape all difagreeable Concourfes, and violent Oppofitions, and, in the most kindly Manner, fend their Influx to the Planet they wait upon: And by the latter, they are perpetually carrying about their Light, and other Benefits from place to place. For by the Motion of the Innermoft, round once in less than two Days; of the next in about 3; Days; of the Third in fomewhat above a Week; and of the Outermost in near 17 Days: By these Means, I fay, it happens very feldom that any part of Jupiter is at any Time without the Prefence and Attendance of one or more of those Satellites; but one is vifiting one part, whilst another is attending another, and another another part, and Jupiter himself making speedy Returns and Revolutions all the while. 4. The last thing remarkable is the Latitudes of Jupiter's Moons, or their their progreffes towards his Poles, which are in a due proportion to their Distances and Periods: As I have before fhewn, Book 5. 4. Ch. And as the Latitudes of these Satellites differ, according to their Diftances and Periods; fo another remarkable Thing therein, is, that they shift their Latitudes, in longer or fhorter Times, according as their Latitudes, or Vagations towards the polar Parts of Jupiter, are greater or leffer. By which Means, fome are making their progreffes towards Jupiter's Foles one way, whilst some are wandering the other way, and fome are staying there a longer Time, and fome a leffer and leffer Time. By which quadruple Variety of Latitudes, and perpetual Changes of it, it comes to pass, that those large Tracts towards the polar Parts of that vaft Planet, have their due Share in the light, and kindly fervices, of its four four Moons, and are feldom or never deprived of them. CHA P. VII. Of Saturn's Moon, Ring, Days, and Seafons. HA AVING feen the admirable provision made for the remedying Jupiter's great Distance from the Sun; let us, in the laft place, take a View of Saturn; which is above 200 millions of English Miles farther from the Sun than Jupiter, and near 700 millions of Miles farther than is our Earth. And here our Glaffes, as imperfect as they are, have discovered fo furprizing an Apparatus, that must needs ftrike every one that views it with Wonder and Amazement. For, For, in the first place, inftead of four Satellites or Moons, as Jupiter hath, Saturn hath five, and probably Three of these I my felf more. have seen with Mr. Huygens's 120 Foot Glafs; but for want of a Pole of fufficient Height to mount the Glafs high enough, I am not fure I have feen any more. And befides thofe five, which others have seen, there is great Reafon to conclude there is a Sixth lying between the two Outermoft, there being a larger Space between them, than is in proportion to what is found amongst the rest. And it is not improbable but that there are others alfo lying beyond the Fifth, or Outermoft, but become invifible at fo great a Distance from us, by Means of fome Obscurity, fuch as is obfervable in the outermoft it felf, which is never to be seen by us, but in the weftern |