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A51133 Dioptrica nova, A treatise of dioptricks in two parts : wherein the various effects and appearances of spherick glasses, both convex and concave, single and combined, in telescopes and microscopes, together with their usefulness in many concerns of humane life, are explained / by William Molyneux of Dublin, Esq. ... Molyneux, William, 1656-1698.; Halley, Edmond, 1656-1742. 1692 (1692) Wing M2405; ESTC R3440 201,330 332

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rare than when Galileo who certainly first discovered them Scheinerus Hevelius attended their Observations viz. about 50 or more years ago About that time one should seldom see the Sun ●s Face no more than now our brighter Beauties here ●elow free from one or more black Patches but now as if they were grown out of Fashion he seldom wears any One in 5 or 7 years hardly appearing As if now he put them on more of necessity to cover an odd Pimple that may otherwise disfigure his Countenance than to adorn his Face How far the Fair Sex should follow his Example I dare not venture to determine But from them we naturally fall to Venus Venus the brightest Planet in the Heavens She fears not sometimes even at Noon-day to display her Beauty and in this Armour reposing an entire Confidence performs her Course alone and free from all other Attendants Mercury's Wit and Quickness secures him therefore he has no Train but generally shelters himself under the Beams of his potent Lord the Sun But both these Inferiour Planets are found by the Telescope to increase and decrease as our Moon For sometimes they appear corniculated sometimes falcated sometimes gibbous and sometimes full even on or nigh to their Conjunctions with the Sun By which last Phaenomenon 't is manifest they move about the Sun sometimes farther from us sometimes nigher to us than he and consequently the Ptolemaick Hypothesis is absolutely false whatever Hyothesis be true And for the Demonstrable Detection of this Error we are beholden to the Telescope And I doubt not but Posterity may by the same Instrument discover some Hypothesis as positively true For the Probabilities of the Copernican System are already so strongly confirm'd thereby that there seems no Room left for any farther Doubt But Time and Labour will yet discover farther Proofs How successfully Mr. Hook has applyed the Telescope to prove the Motion of the Earth I leave the Reader to judge upon Perusal of his Attempt 16. And thus at last are we arrived at home to contemplate our Neighbour the Moon Her may we properly call our own as making us the Centre of her Periodical Motion For as the Satellites about Saturn or Iupiter move round them so moves the Moon as a Satellite about our Earth Galileo with his Telescope first discover'd great Ruggedness in the Moons Face after him Langrenus the King of Spain's Cosmographer attempted to draw her Picture But the noble Hevelius in his curious and costly Work of Selenography has perfected this Affair perhaps beyond Amendment There may we see the Moons Countenance distinguished in an admirable difference of Parts both for Shape and Colour We may there see greater Parts that resemble our Seas Lakes Rivers Islands Peninsulas and Continents other lesser Spots almost infinite in number that resemble our Mountains Hills and Vallies Of the greater Parts those that are something obscure may we reckon Seas and Lakes and the brighter may we account Land For just so does our Earth appear when from a distant Height we look upon a Mixture of Land and Water enlightened by the Sun Of the smaller Spots those that are brightest and shine are Mountains and Rocks and the darker Parts which are usually encompassed with these brighter Verges may we esteem Vallies Now that some Parts of the Moon are much higher than others is as manifest by the Telescope as that some Parts of our Earth are higher than others For if we look upon it about the Quarter-days we shall plainly see the Edge towards the dark Part broken and cragged and many little bright Spots that are clearly separated from the rest of the enlightned Part. Which is an evident Proof that these are the high Tops of Eminencies which receive the Suns Light before the Parts below them are enlightned Moreover the Moons Spots cast their Shadows opposite to the Sun that is to the Eastward whilst the Moon is Increasing and to the Westward on her Decrease That these Mountains are very high is manifest from the way of Measuring them delivered in Riccioli Almagest 1. Pag. 208. And Tacquet Geom. Prac. Cap. 8. Prob. 2. For the better distinguishing these Spots and making them more useful in the Observation of Lunar Eclipses there are names imposed on them by Authours Hevelius assigns to them the names of Places here on Earth Grimaldus and Ri●●iolus give to them the names of famous Mathematicians and Astronomers By means of these Spots Lunar Eclipses are now much more accurately observed than formerly to the great Advancement of Geography and Navigation in setling the Longitudes of Places For now the Immersions and Emersions of these Spots from the Shadow of the Earth are most nicely determined Moreover by these Spots the Moon is discovered to have various librating Motions from East to West and from West to East also from North to South and from South to North. But hereof we cannot now enlarge vid. Bullialdi Astrom Philolaic Lib. 3. Cap. 13. Hevelii Selenograph Riccioli Almagest 1. Lib. 4. Cap. 9. Neither is it needful to insist on the Moons Transits over and Appulses to fixt Stars and Planets which can never be accurately observed but by the Telescope I cannot tell whether it be worth our while to take notice in this Place that Mons. Isaac Vossius has published a fantastical Conceit of his own for explicating the Appearance of the Moons Spots in his Liber va●iarum Observationum 17. And now perhaps we may be allowed to sit down and think awhile whether all these Celestial Bodies that thus dance round our Sun may not be inhabited But this Disquisition has been already so ingeniously managed by several particularly by the Reverend Dr. Wilkins Bishop of Chester in his World in the Moon and by Mons. Fontenel his Plurality of Worlds that there is little left to be said on the Subject I shall only add that there is nothing in Nature Morality or Religion that contradicts the Affirmative of this Opinion And 't is through a narrowness of Thought that some men deny it They will not think on any other sort of Creatures than what we see here on Earth and presently begin to ask how should Men possibly live in Saturn's cold Climates or in the scorching Heat that affects Mercury But shall we thus confine the Great Creator to our poor Conceptions Cannot he that has made a Man a Whale an Elephant a Fly be able to create indefinite Varieties of Creatures and all endowed with different Faculties and various Ways of Perception Some adapted to one Planet others to others And all these may be ingaged in different Ways of Life and Thought but should all be ingaged in Praising and Serving him that gave them all their Beings 18. But here I quit these remote Thoughts and from viewing the admirable Extent Beauty Order and Variety of the Creation abroad betake my self home to our own Globe And here we shall not