The Planetary and Stellar Worlds: A Popular Exposition of the Great Discoveries and Theories of Modern Astronomy

accomplished actually ages appear astronomer attention axis beautiful became become body cause central centre circle close comet coming commenced computed curve detected determined diameter direction discovered discovery distance earth eclipse effect efforts entire equal equator examination existence fact fall figure finally fixed stars force give given grand gravitation heavens human hundred impossible increase influence Jupiter known less light limits magnitude marked mass matter mean measure mighty miles millions mind moon moon's motion move movements nature nearly never night object observation obtained once orbit pass period planet planetary position possible precisely present problem produced question reached reasoning region remain remarkable revealed revolution revolving round satellites seen single slowly solar space success sun's sweeping telescope theory thousand tion true truth unit universe vast watch wonderful