## American Practical Navigator |

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### Common terms and phrases

anchor angle apparent altitude azimuth cable calculation centre chronometer circle column compass Corr correct altitude correct central altitude corresponding Cosec cosine degrees diff difference of latitude difference of longitude Disl Dist elapsed equal equator error EXAMPLE feet given Greenwich half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure line of numbers logarithm lower limb mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points polar distance pole radius 90 refraction right ascension ro ro ro screw sea account secant semidiameter sextant ship ship's side sine star subtract sun's declination Suppose taken tangent telescope traverse table triangle true altitude true distance true longitude variation wind wires zenith distance