Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 265
Washington Observatory discovered that Mars isaccompanied by two small moons, whose orbits are shownin Fig. 270. The inner satellite has been named Phobos,and the outer one Dei?nos. It is estimated that the diame-ter of the outer moon is from five to ten miles, and thatof the inner one from ten to… … Fig. 269. the planet is about six thousand miles, and from the surfaceless than four thousand. Astronomers on Mars, with tele-scopes and eyes like ours, could readily find out whether
Astronomy
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