Lowell, Percival, 1855-1916 · New York, The Macmillan Company · leaf 136
d, a tint extending even to thedarkish hoods over the planets caps. This huecomes out well in good seeing, and best, as with allplanetary markings, in twilight, not at night, becausethe excessive brightness of the disk is then taken off,preventing the colors from being swamped. This brings us to… … something else. The albedo of cloud is 72 per centof absolute whiteness. What looks like cloud, then,is such, on that distantdisk. But Jupiter sur-passes cloud in lustre, sincehis albedo exceeds 72 percent. Yet a large part ofhis surface is strikinglydarker than that. The in-ference from this is…
Cosmogony
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