Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>B A D</
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<
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>Chord</
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>4034</
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<
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>Angles</
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<
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>4034</
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<
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>391992</
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<
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<
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>293994</
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<
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<
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<
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>391992</
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<
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<
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<
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>27</
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<
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</
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<
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<
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>145</
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<
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>3953</
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<
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>23932</
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>
</
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<
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<
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<
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>1058</
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<
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<
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<
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>3</
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>In the ſixth operation the chord, the ſines and Parallax are as
<
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followeth, and the ſtar is found to be about 4 ſemidiameters; let
<
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us ſee whether it will be reduced, abating the Parallax from 8
<
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m.
<
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<
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to 1
<
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type
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m.
<
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onely; Here is the operation, and the ſtar raiſed but to
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27. ſemidiameters or thereabout; therefore the correction of 7
<
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m.
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<
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in 8
<
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m.
<
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doth not
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<
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>B D</
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<
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>Chord</
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>
<
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>1920</
cell
>
</
row
>
<
row
>
<
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>B D C</
cell
>
<
cell
>Sine</
cell
>
<
cell
>40248</
cell
>
</
row
>
<
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>
<
cell
>B C D 8
<
emph
type
="
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"/>
gr.
<
emph.end
type
="
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</
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>
<
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>Sine</
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>
<
cell
>233</
cell
>
</
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<
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<
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>40248</
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<
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<
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/>
<
cell
>1920</
cell
>
<
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/>
</
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>
<
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>
<
cell
/>
<
cell
>804960</
cell
>
<
cell
/>
</
row
>
<
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>
<
cell
/>
<
cell
>362232</
cell
>
<
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/>
</
row
>
<
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>
<
cell
/>
<
cell
>40248</
cell
>
<
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/>
</
row
>
<
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>
<
cell
/>
<
cell
>26</
cell
>
<
cell
/>
</
row
>
<
row
>
<
cell
>29</
cell
>
<
cell
>772</
cell
>
<
cell
>76160</
cell
>
</
row
>
<
row
>
<
cell
/>
<
cell
>198</
cell
>
<
cell
/>
</
row
>
<
row
>
<
cell
/>
<
cell
>1</
cell
>
<
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/>
</
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>
</
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>
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<
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>In the eighth operation the chord, the ſines, and the Parallax,
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as you ſee, are theſe enſuing, and hence the Authour calculates
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the height of the ſtar to be 1. ſemidiameter and an half, with the
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Parallax of 43.
<
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type
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min.
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type
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which reduced to 1
<
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type
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min.
<
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yet
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ing giveth the ſtar leſſe remote than 24. ſemidiameters, the
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ction therefore of 42.
<
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type
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min.
<
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is not
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