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 27
lymakes one revolution about the earth in a sidereal day. Thesolar day is, on the average, about 3m. 56s. longer than thesidereal day. 8. Some of the preceding definitions are illustrated in thediagram, Fig. 3. In this figure 0 is the position of the observer,HESW his celestial horizon, Pp the axis… … hour circle. The circle EC WD is the equinoctial, and the circleEZWN, perpendicular to the meridian, is the prime vertical, 22 THEOREMS. cutting the horizon in E and W, the east and the west point ofthe horizon. The equinoctial, being also perpendicular to themeridian, passes through the same…
Astronomy
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