Celestial scenery, or, The Wonders of the planetary system displayed : illustrating the perfections of deity and a plurality of worlds (1845)
Dick, Thomas, 1774-1857, Parker, E. S., former owner. DSI, David H. DeVorkin Collection (Smithsonian Institution. Libraries) DSI · Philadelphia : Published by Edward C. Biddle · leaf 121
lanets. Consequently, a spec-tator on the earth is enabled to see a greater portion of thedark hemisphere of Mars, and, of course, loses sight of a cor-responding portion of his enlightened disk. This is repre-sented by the line h i. This gibbous phase of Mars, however,differs only in a small… … point F, when Mars appears in opposition to the sun, the wholeof his enlightened hemisphere is then visible. The extent ofthe gibbous phase of this planet affords a measure of the angleS MD, and, therefore, of the proportion of the distance, S3f,of Mars, to S D or S F, the distance of the earth…
Astronomy
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