Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 83
e difference of the hour angles of the same celestia..body at that place and at Greenwich, at the same absohde instantof time. When the Greenwich hour angle is the greater of thes<Ltwo hour angles, reckoned always to the west, the longitude ofthe place is west: when it is the smaller, the… … CHRONOMETERS. 77 vernal equinox, the longitude is the difference of the two side-real time*. 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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