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