The book presents a comprehensive treatment of celestial navigation
based upon the essential foundations of nautical astronomy and
spherical trigonometry. Beginning with a discussion of position and
time, it proceeds systematically to show how sextant observations
coupled with time provide indispensable checks and information on
course, distance, and position. Emphasizing computational rather
than tabular solutions to sight reduction problems, while basic
trigonometric formulae are developed, all computation is done with
the most inexpensive hand calculator. The author also stresses the
backgrounds of nautical astronomy, beyond the perfunctory routines
of sight reduction. The reader, in other words, learns not only
what, but why. While the treatment is directed toward the cruising
sailor who wishes to plan and undertake oceanic voyages, it is
sufficiently comprehensive to fulfill the needs of the professional
mariner.
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