Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 196
our own polar regions, we should see a white The Ixxer Planets. 181 cap at the middle of the arctic circle. This appearancewould be produced by the eternal ice and snow. Itwould increase during the long, dark winter, and thenbe somewhat reduced by melting during the continu-ously bright summer.… … Fig. 60.—The South Pole of Mars, September, 1S77. (Green.) of Mars winter, and which declines again in some degreewith the warmth of the ensuing summer. Sketches of Mars have been made by many astro-nomers; among them we may mention Mr. Green, whomade a beautiful series of pictures at Madeira in…
Astronomy
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