Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 323
302 ASTRONOMY. sphere is visible, and the planet has the form of the Moonat first or second quarter. As it approaches inferior con-junction, the apparent visible disk assumes the form ofa crescent, which becomes thinner and thinner as theplanet approaches the Sun. (See Fig. 174.) … Fig. 173.—Apparent Diameter of Venus; A, at GreatestB, at Mean ; C, at Least Distance. The phases of an inferior planet were first observed byGalileo in 1610. They are not visible to the naked eyennd hence their discovery dates from the invention of the •»>) B c • < c c K Fig. 174.—Phases…
Astronomy
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