Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 158
slightlyelliptical, has by its roughness in certain parts assisted inaffording an idea of elevations and depressions on Venus, andin estimating the time of rotation. While this is to be regardedas well determined, it is a little less than 24 hours, accordingto M. Trouvelot. On page 108 is one of… … The Plaints 11 i i much smaller planet than the Earth, his in diameter being only 4,230 miles; but the ellip-ticity of his figure is greater, the difference betweenhis polar and equa-torial diameters beingabout a hundredthpart of the latter.The mass of Marsis about one ninththat of the Earth,and…
Astronomy
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