Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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be produced alſo; in the mean time, that I may not prevent any
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one, I will ſuppreſſe the anſwer which might be given, and onely
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for this time betake my ſelf to ſatisfie the objections brought by
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Simplicius.
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I ſay therefore, that this reaſon of yours is too
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neral, and as you apply it not to all the appearances one by one;
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which are ſeen in the Moon, and for which my ſelf and others
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are induced to hold it mountainous, I believe you will not find
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any one that will be ſatisfied with ſuch a doctrine; nor can I think,
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that either you, or the Author himſelf, find in it any greater
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quietude, than in any other thing wide from the purpoſe. </
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>Of the
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very many ſeveral appearances which are ſeen night by night in
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the courſe of Moon, you cannot imitate ſo much as one, by making
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a Ball at your choice, more or leſs opacous and perſpicuous, and
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that is of a polite ſuperficies; whereas on the contrary, one may
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make Balls of any ſolid matter whatſoever, that is not tranſparent,
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which onely with eminencies and cavities, and by receiving the
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lumination ſeveral ways, ſhall repreſent the ſame appearances and
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mutations to an hair, which from hour to hour are diſcovered in
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the Moon. </
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>In them you ſhall ſee the ledges of Hills expoſed to
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the Suns light, to be very ſhining, and after them the projections
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of their ſhadows very obſcure; you ſhall ſee them greater and leſs,
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according as the ſaid eminencies ſhall be more or leſs diſtant from
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the confines which diſtinguiſh the parts of the Moon illuminated,
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from the obſcure: you ſhall ſee the ſame term and confine, not
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equally diftended, as it would be if the Ball were poliſh'd, but
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craggie and rugged. </
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>You ſhall ſee beyond the ſame term, in the
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dark parts of the Moon many bright prominencies, and diſtinct
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from the reſt of the illuminations: you ſhall ſee the ſhadows
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foreſaid, according as the illumination gradually riſeth, to
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niſh by degrees, till they wholly diſappear; nor are there any of
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them to be ſeen when the whole Hemiſphere is enlightned. </
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gain on the contrary, in the lights paſſage towards the other
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miſphere of the Moon, you ſhall again obſerve the ſame
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cies that were marked, and you ſhall ſee the projections of their
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ſhadows to be made a contrary way, and to decreaſe by degrees:
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of which things, once more I ſay, you cannot ſhew me ſo much as
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one in yours that are opacous and perſpicuous.</
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The apparent
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evenneſſes of the
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Moon cannot be
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mitated by way of
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more and leſs
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city & perſpicuity.
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The various
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ſpects of the Moon,
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imitable with any
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opacous matter.
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Various appear
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ces from which the
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Moons montuoſity
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is argued.
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>SAGR. </
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>One of them certainly he may imitate, namely, that of
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the Full-Moon, when by reaſon of its being all illuminated, there
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is not to be ſeen either ſhadow, or other thing, which receiveth
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any alteration from its eminencies and cavities. </
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<
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>But I beſeech
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you,
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Salviatus,
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let us ſpend no more time on this Argument, for
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a perſon that hath had but the patience to make obſervation of but
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one or two Lunations, and is not ſatisfied with this moſt ſenſible
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truth, may well be adjudged void of all judgment; and upon </
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