Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 339
e, being simply the differencebetween the Greenwich time and the local time. In certain cases where the chronometers have been forsome reason disturbed, the mariner is obliged to get his Green-wich time by observing with a sextant the distance of themoon from some neighboring fixed star, but the… … draw from it a line, SO, directed toward the vernal equinox,from which longitudes are measured. Lay off from S linesindefinite in length, making angles with SO equal to the earths longitude as seenfrom the sun on eachof the days when theobservations are made(earths longitude equalssuns longitude +…
Astronomy
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