Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.

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Title

Author

Leybourn, William, 1626-1716.

Publication

London :: printed by James Flesher, for George Sawbridge, living upon Clerken-well-green,

anno Dom. 1669.

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Link to this Item

http://name.umdl.umich.edu/A48344.0001.001

Cite this Item

"Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A48344.0001.001. University of Michigan Library Digital Collections. Accessed June 17, 2024.

Pages

CASE V. The Angles being given, to find the other Parts.

IF the two Angles P ☉ O and O P ☉ be given, there may be found 3.

1. P O, the Latitude.
2. ☉ O, the Amplitude from the North.
3. P ☉, the Complement of the Sun's Declination.

Thus you see, that in this one Right-angled Sphericall Tri∣angle, by the several Parts given in these five Cases, there are 30 Sphericall Problems resolved; and so many are resolvable in every Right-angled Triangle.