Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſeen in that ſame note obſerved the ſtar in the polar altitude of 55
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degrees and 58
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mi. </
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And the polar altitude of the
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Landgrave
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was 51 degrees and 18
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mi. </
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The altitude of the ſtar in the
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ridian taken by
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Tycho
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was 27 degrees 45
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mi. </
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The
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grave
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found its altitude 23 degrees 3
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mi. </
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The which altitudes
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are theſe noted here, as you
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gr.
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m.
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gr.
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m.
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<
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<
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Tycho
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Pole</
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<
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>55</
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<
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>58</
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<
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>* 27</
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<
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>45</
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<
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<
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Landgr.
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Pole</
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<
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>51</
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<
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>18</
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<
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>* 23</
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>This done, ſubſtract the leſſe from the greater, and there remains
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theſe differences here
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<
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gr.
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</
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<
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m.
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</
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</
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<
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<
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<
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>4</
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<
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>40</
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<
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<
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<
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>4</
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<
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>42</
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<
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<
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>Parall.</
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<
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<
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>Where the difference of the poles altitudes 4
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gr. </
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>4 mi. </
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<
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is leſſe than the difference of the altitudes of the Star 4
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gr. </
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<
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>42 mi.
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</
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<
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>pr.
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and therefore we have the difference of parallaxes, 0
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gr. </
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<
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>2 mi.
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</
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<
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>pri.
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Theſe things being found, take the Authours own figure
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[
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Fig. </
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<
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>2.
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] in which the point B is the ſtation of the
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Landgrave,
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D the ſtation of
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Tycho,
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C the place of the ſtar, A the centre
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of the Earth, A B E the vertical line of the
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Landgrave,
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A D F
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of
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Tycho,
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and the angle B C D the difference of Parallaxes. </
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<
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>And </
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