The two Places upon the Projection are noted with the Letters C and D, both lying in the Latitude of 43 degr. but Constantinople in the Longitude of 63 degr. and Compo∣stella in the Longitude of 106 d. 15 min. So that their diffe∣rence of Longitude is 43 degr. 15 min. Wherefore through the two Places C and D draw the Arch of a great Circle, and find the Pole thereof; (which to effect is already taught at the beginning of this Book:) which Pole will be at the Point M. Then laying a Ruler upon M and C, it will cut the first Meridian in the Point d; and laid from M to D, it will cut the first Meridian in e: the Distance between d and e, mea∣sured upon the Line of Chords, will be found to contain 31 degr. 16 min. which, converted into Miles, giveth 1876, the Distance as before.
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
- 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.
- Author
- Leybourn, William, 1626-1716.
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- London :: printed by James Flesher, for George Sawbridge, living upon Clerken-well-green,
- anno Dom. 1669.
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http://name.umdl.umich.edu/A48344.0001.001
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"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
To find the Distance of these two Places upon the Projection.