The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 218
f a cone, the lengthof which will be proportional to the size and distance of theplanet from the Sun. 434. When do solar eclipses occur? Why only then? Lunar? Why only at fullmoon? 435. Do all the planets cast shadows? Suppose the Sun and planet were ofthe same size, what would be the form of their… … ^4lft,j In this cut, the opaque body Is the larger, and the shadow projected from it diverge*.or grows more broad as the distance from the planet increases. If the opaque body is smaller than the luminous nne, the shadow converges to apoint. CONVERGING SHADOW. k-Sj Here the luminous body is the…
Constellations · Stars
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