## An elementary treatise on plane & spherical trigonometry: with their applications to navigation, surveying, heights, and distances, and spherical astronomy, and particularly adapted to explaining the construction of Bowditch's navigator, and the nautical almanac |

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adjacent ascension and declination azimuth calculated celestial celestial equator celestial sphere circle column computed Corollary corr corresponding cosec cosine cotan course denote departure diff difference of latitude difference of longitude dist earth earth's centre ecliptic equal to 90 equator find the sine formula given angle gives Greenwich Hence horizon horizontal parallax hour angle hypothenuse included angle interval logarithm mean meridian altitude method middle latitude miles moon moon's motion Nautical Almanac Navigator obliquity observer at Boston obtuse perpendicular plane plane of reference polar pole position Problem Prop proportion radius rhumb right ascension Scholium secant second member semidiameter shadow sideral sideral day solar Solution solve the triangle spherical right triangle spherical triangle star star's sun's tang tangent transit Trig Trigonometry true latitude vernal equinox vertical whence zenith