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Plane and spherical trigonometry (1887)

Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 148

An illustration from Plane and spherical trigonometry, 1887, leaf 148
8 A … Fig. 47. The earths diurnal motion causes all the heavenly bodiesto appear to rotate from east to west at the uniform rate of15° per hour. If in Fig. 46 we conceive the observerplaced at the centre 0, and his zenith, horizon, and celestialmeridian fixed in position, and all the heavenly bodies…

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