A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 348
mine the time of rotation so accurately ofcourse implies the existence of identifiable markings upon the sur-face. Viewed througha powerful telescope,the planets disc, as awhole, is ruddy, — infact, almost rose color,— very bright aroundthe limb, but not at the terminator, if there is any… … 336 MARS. outlines reasonably distinct. On watching the planet for ouly a fewhours even, the markings pass on across the disc, and are replacedby others. Some of them are permanent, and recur at regular in-tervals with the same form and appearance, while others appear tobe only clouds which for a…
Astronomy
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