## The Theory and Practice of Finding the Longitude at Sea Or Land: To which are Added, Various Methods of Determining the Latitude of a Place, and Variation of the Compass; with New Tables. By Andrew Mackay, ... |

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Aberdeen according adjuſtment alſo angle anſwering apparent altitude applied arc firſt arch azimuth called caſe co-fecant co-fine Co-verſed compared computing contained correction declination Diff difference direct diſt diſtance Earth eclipſe equal equation error EXAMPLE fecant feet femidiameter finding the Longitude fine firſt Fixed Star give given glaſs Greenwich half height Hence horizon horizontal parallax inſtrument interval known latitude limb London longitude mean meridian method minutes Moon Moon's motion move muſt natural Nautical noon object obſerved parallax parallel place of obſervation planet PROBLEM proper proportional quadrant reduced refraction Required right aſcenſion riſing RULE ſame ſecond ſet ſhip ſine ſtar ſubtract ſum Sun's taken tangent theſe third tion tranſit true true altitude true diſtance tude uſed variation Verſed ſine watch zenith