Lowell, Percival, 1855-1916 · New York, The Macmillan company · leaf 94
we take Too^iooo ^^ ^^^ nearest roundnumber, we find the planets density to be 0.66 thatof the Earth. The same observations that disclosed at Flagstaffthe planets size revealed a set of markings on his faceso definite as to make the rotation period unmistakable. THE INNER PLANETS 69 It takes place,… … the ellipticity of the planets orbit stood reflected inthe sv^ing of the markings across the face of the disk,a definiteness in the proof of a really surprising kind.What this means we shall see in a subsequent chap-ter when we take up the mechanical problem of thetides. Another result that issued…
Cosmogony
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