Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ous rayes, nor can this their inadvertency be excuſed, in regard
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that it was in their power to have beheld them at their pleaſure
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without thoſe treſſes, which is done, by looking upon them at
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their firſt appearance in the evening, or their laſt occultation in
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the comming on of day; and if none of the reſt, yet
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Venus,
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which oft times is ſeen at noon day, ſo ſmall, that one muſt
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pen the ſight in diſcerning it; and again, in the following night,
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ſeemeth a great flake of light, might advertiſe them of their
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lacy; for I will not believe that they thought the true
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Diſcus
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to
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be that which is ſeen in the obſcureſt darkneſſes, and not that
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which is diſcerned in the luminous
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Medium
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: for our lights, which
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ſeen by night afar off appear great, and neer at hand ſhew their
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true luſtre to be terminate and ſmall, might have eaſily have
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made them cautious; nay, if I may freely ſpeak my thoughts, I
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abſolutely believe that none of them, no not
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Tycho
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himſelf, ſo
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accurate in handling Aſtronomical Inſtruments, and that ſo great
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and accurate, without ſparing very great coſt in their
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ction, did ever go about to take and meaſure the apparent
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meter of any Star, the Sun and Moon excepted; but I think,
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that arbitrarily, and as we ſay, with the eye, ſome one of the
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more antient of them pronounced the thing to be ſo and ſo, and
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that all that followed him afterwards, without more ado, kept
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cloſe to what the firſt had ſaid; for if any one of them had
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plied himſelf to have made ſome new proof of the ſame, he would
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doubtleſſe have diſcovered the fraud.</
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A common
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rour of all the
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ſtronomers,
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ing the magnitude
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of the ſtars.
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Venus
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renders the
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errour of
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mers in
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ing the magnitudes
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of ſtars
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ble.
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>SAGR. </
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>But if they wanted the Teleſcope, and you have
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ready ſaid, that our
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Friend
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with that ſame Inſtrument came to
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the knowledge of the truth, they ought to be excuſed, and not
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accuſed of ignorance.</
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<
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>SALV. </
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>This would hold good, if without the Teleſcope the
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buſineſſe could not be effected. </
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<
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>Its true, that this Inſtrument by
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ſhewing the
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Diſcus
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of the Star naked, and magnified an
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dred or a thouſand times, rendereth the operation much more
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ſie, but the ſame thing may be done, although not altogether ſo
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exactly, without the Inſtrument, and I have many times done
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the ſame, and my method therein was this. </
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>I have cauſed a rope
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to be hanged towards ſome Star, and I have made uſe of the
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Conſtellation, called the
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Harp,
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which riſeth between the North
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and ^{*} North-eaſt, and then by going towards, and from
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the ſaid rope, interpoſed between me and the Star, I have found
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the place from whence the thickneſſe of the rope hath juſt hid
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the Star from me: this done, I have taken the diſtance from the
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eye to the rope, which was one of the ſides including the angle
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that was compoſed in the eye, and ^{*} which inſiſteth upon the
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thickneſſe of the rope, and which is like, yea the ſame with the </
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