The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 152
I48. PROBLEM V. To meafure any projected fpherical angle. General Solution. Find the poles of the two circles which formhe angle; and from the angular po.int draw lines thro thofe poles to cuthe primitive circle. Then the meafure of that angle, if acute, will be. the intercepted arc^f the primitive… … Let the propofed angle be dab, formed by the great circles ad, ab,hofe poles are c and p ; and lines drawn from the angular point a throis pojes c and p cut the primitive circle in e an i p. S ift. I JO SPHERICS. iff. When the angle is formed by the primitive and oblique circles. Then the arc p e…
Navigation · Nautical astronomy · Fortification
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