Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 245
point andW the west jpoint. The angleOEM is nearly 8|°, and OCM isnearly 21^° ; hence, the upperarc EBW is equal to 163°, andthe arc CAD to 137|°. Deimos** rises at E and sets at W, remain- Showing the Apparent Motions ™g above the horizon 2.413d., orof the Satellites of Mars. 57h. 52m. ; Phobos… … Fig. 90. PLANETS AND SATELLITES. 241 sidereal periods, Deimos will go through its entire cycle of phases inabout 30 hours, and Phobos in less than 8 hours. The fact that Phobos revolves from west to east at a more rapidrate than the planet itself, would seem to be an argument against thenebular…
Astronomy
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