A Treatise on Navigation and Nautical Astronomy

Altair amplitude apparent altitude apparent noon azimuth celestial object centre chronometer showed circle colatitude compass computed Correction cos² cosec course and distance Date at place Diff difference of latitude difference of longitude east equal altitudes equation of equal eye 19 feet FIND THE LATITUDE formula given Greenwich date Greenwich mean height horizon horizontal parallax hour angle index error latitude and longitude lunar distance Markab mean noon mean solar mean sun Mercator's miles moon moon's Nautical Almanac North polar distance observed altitude observed meridian altitude P.M. mean parallax parallel place of observation plane sailing point of Aries polar dist polar distance pole prime vertical refraction required the latitude required the variation rhumb line right ascension semidiameter sextant sidereal sin² star's subtracted sun's declination triangle true altitude True distance tude vertex westerly meridian distance wind zenith distance ΙΟ