Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 238
ent phase. Fig. 79 illustrates the phases of Mercury (and equally of Venus). 222 MERCURY. [§ 318 The atmosphere of the planet cannot be as dense as that ofVenus, because at a transit it shows no encircling ring oilight, as Venus does (Art. 324) ; both Huggins and Vogel,however, report… … Fig. 79. — Phases of Mercury and Venus. taken to screen the object-glass of the telescope from directsunlight, the observation is not specially difficult. The sur-face presents very little of interest. It is brighter at the edgethan at the centre, but until recently no markings have beenobserved…
Astronomy · Constellations
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