Lowell, Percival, 1855-1916 · New York, The Macmillan Company · leaf 237
Marsis such that its present eccentricity is greater thanwhat the Earth ever can have had, and the wintersolstice of the planets southern hemisphere fallswithin 230 of its aphelion point. We have then theconditions for glaciation if these are the astronomic 198 THE EVOLUTION OF WORLDS ones… … Mars.north polar cap. south polar cap. At maximum full extent of white At maximum white At minimum inner circle At minimum nothing edge of the Martian polar caps exceeding in some re-spects what we know of our own. The accompanyingdiagrams exhibit the state of things at a glance, themaximum and…
Cosmogony
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