A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 347
d superficial gravity 0.38; that is, a bodywhich weighs 100 pounds on the earth would have a weight of 38pounds on the surface of Mars. 582. Phases. — Since the orbit of the planet is outside that of theearth, it never comes between us and the sun,and can never show the crescent phase; but… … Fig. 174. 583. The Albedo of the Planet. — Accord-Greatest Phase of Mars. inS to Zollners observations this is 0.26, whichis considerably higher thau that of the moon(^), and just double that of Mercury. 584. Rotation. — The planets time of rotation is 24h 37m 22s.67.This very exact determination…
Astronomy
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