 | Robert Gibson - Surveying - 1811 - 580 pages
...side of the meridian, their difference is the variation : but if one be on the east and the other on the west side of the meridian, their sum is the variation...variation is west. EXAMPLE. November 2, 1812, in latitude 259 32' N. and longitude 75° W. the altitude of the Sun's lower limb was observed to be 15° So*',... | |
 | Robert Gibson - Surveying - 1814 - 558 pages
...side of the meridian, their difference is the variation : but if one be on the east, and the other on the west side of the meridian, their sum is the variation...N. and longitude 75° W. the altitude of the Sun's low«r limb was observed to be 15° 36', about 4h. 10m. PM his magnetic azimuth at that time being... | |
 | Alexander Baharie - 1844 - 218 pages
...180 deg., — the difference between this remainder and the magnetic azimuth will be the variation : then, if the true azimuth be to the right of the magnetic, the variation will be east ; but if it be to the left, the variation will be west. LEEWAY. Leeway is the angle which... | |
 | John William Norie - Nautical astronomy - 1852 - 844 pages
...the true azimuth from 18(P, and the difference between the remainder and the magnetic azimuth will be the variation : and to know if it be east or west,...left of the magnetic the variation is west. EXAMPLE I. July 20, 1854, in latitude 21°42'N., and longitude 150"E., at 7h. 4m. AM (or July 19, at 19h. 4m.,... | |
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Ъои) on the east, or both on the west side of the meridian, their difference is the variation : but if one be on the east, and the other on the west side of the meridian, their sum is the variation ; and to know if it be east or west, suppose the observer... 