Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 331
In thus representing the apparent angular magnitudeof these planets, we suppose their whole disks to be visible,as they would be if they shone by their own light. Butsince they can be seen only by the reflected light of thesun, only those portions of the disk can be seen which areat the same time… … Fig. 86.—apparent magnitudes op disk of venus. When the planet is at its greatest distance, or in superiorconjunction ((7, Fig. 84), its whole illuminated hemispherecan be seen from the earth. As it moves around and ap-proaches the earth, the illuminated hemisphere is graduallyturned from us. At…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
