Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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>Let us now ſee the ninth. </
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>Here is the chord, the ſines and
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the Parallax which is 15
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m.
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From whence the Authour
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lates the diſtance of the ſtar from the ſuperficies of the Earth
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to be leſſe than a ^{*} ſeven and fortieth part of a ſemidiameter,
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but this is an errour in the calcultaion, for it cometh forth truly,
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as we ſhall ſee here below, more than a ſifth: See here the
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tienr is 90/436, which is more than one
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* Here the
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tine verſion is
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neous, making it
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a fortieth part of,
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&c.
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>B D C</
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>Sine</
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>232</
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>78092</
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>That which the Authour preſently after ſubjoyns in way of
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amending the obſervations, that is, that it ſuſſiceth not to
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duce the difference of Parallax, neither to a minute, nor yet
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to the eighth part of a minute is true. </
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<
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>But I ſay, that neither
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will the tenth part of a minute reduce the height of the ſtar to
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32. ſemidiameters; for the ſine of the tenth part of a minute,
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that is of ſix ſeconds, is 3; by which if we according to our Rule
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ſhould divide 90. or we may ſay, if we ſhould divide 9058672.
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by 300000. the quotient will be 30 58672/100000, that is little more
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than 30. ſemidiameters and an half.</
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<
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>The tenth giveth the altitude of the ſtar one fifth of a
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diameter, with theſe angles, ſines, and Parallax, that is, 4
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gr.
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