Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 186
Probably it is about one-twenty-seventh of the earths mass; it is certainly smallerthan that of any other planet (asteroids excepted). Our un-certainty as to the mass prevents us from assigning certainvalues to its density or superficial gravity, though it is prob-ably two-thirds as dense as the… … Fig. 48. — Phases of Mercury and Venus. phases precisely similar to those of our satellite. At inferiorconjunction the dark side is towards us; at superior conjunc-tion the illuminated surface. At greatest elongation, theplanet appears as a half-moon. It is gibbous between superiorconjunction and…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
