## American Practical NavigatorU.S. Government Printing Office, 1826 - Navigation |

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### Common terms and phrases

angle arch azimuth bearing calculation Cape central index centre circle co-sec co-sine column compass corresponding course sailed degrees diameter Diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet find the course Funchal given Greenwich half sum horizon glass hour angle hypotenuse instrument latitude and departure line of numbers line of sines logarithm marked mean meridian altitude meridional difference method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallax parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points quadrant radius 90 refraction right ascension rule screw sea account secant semi-diameter sextant ship ship's side Sine Course star subtracted sun's declination sun's lower limb Suppose taken tangent telescope tion triangle true altitude true distance tude variation watch wind zenith distance