Noon-Interval Tables: First Edition (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Noon-Interval Tables: First Edition

The result computed from the morning time-sight of the sun, usually stated as the local apparent time, gives also the angle at the pole, or difference of longitude expressed in hours, minutes, and seconds, between the meridian of the observer and the meridian passing through the geographical position of the sun, or that place on the surface of the globe which has the sun in its zenith at the instant of observation. When the observer remains stationary, the interval of time that must elapse before the sun crosses his meridian, or the arrival of apparent noon, is therefore given by the number of hours, minutes, and seconds in this angle at the pole, or hour-angle, which interval is equal to the remainder found by subtracting from 12' hours the local apparent time. But when the observer is changing his place, if his movement has a component of change of place to the eastward or to the westward, that is, a component of change of longitude, the interval to noon will be shortened or lengthened according as his change of place causes him to move to the eastward to meet the sun, or to the westward to be overtaken by the sun.

The rate of change of longitude of the sun's geographical position in its diurnal path from east to west is 15° or 900' per hour, and if to this be added the hourly change in longitude of the observer When his change of place is to the eastward, or if from it be subtracted his hourly change in longitude when his change of place is to the westward.

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