Navigation and Nautical Astronomy1861 |
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24 hours altitude for index apparent altitude April 27 ascension mean sun astronomical celestial concave celestial equator chro chronometer showed colatitude compass course course and distance decl deviation diff difference of latitude east ecliptic Elements from Nautical find the latitude Greenwich date Greenwich mean noon haversines heavenly body height of eye horizontal parallax hour angle Index cor index correction July June latitude and longitude mean solar mean time nearly miles moon Moon's declination moon's semidiameter Nautical Almanac observed altitude observed meridian altitude P.M. mean Parallel Sailing pass the meridian point of Aries polar distance pole proportional logarithm refraction required the latitude required the longitude required the true Right asc Right ascension mean sea 20 feet ship mean ship's head sidereal spectator star subtract Sun's declination sun's L. L. sun's lower limb true altitude true bearing true course true distance versine zenith distance