The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 82
the difference of the hour angles of the same celestialbody at that place and at Greemvich, at the same absolute instantof time. When the Greenwich hour angle is the greater of thesetwo hour angles, reckoned always to the west, the longitude ofthe place is west: when it is the smaller, the… … CHRONOMETERS. 7 i vernal equinox, the longitude is the difference of the two side-real times. In order, then, to determine the longitude of anyplace, we must be able to determine both the local and theGreenwich time (either sidereal or solar) at the same instant. There are various methods of…
Astronomy
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