The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 251
and their orbits are not confined to any par-ticular part of the heavens ; nor do they observe any one generaldirection. The orbits of the planets approach nearly to circles, whilethose of the comets are very elongated ellipses. A wire hoop,for example, will represent the orbit of a planet. If two… … Here it will be seen that the orbit is very eccentric, that the perihelion point is verynear the Sun, and the aphelion point very remote. There is, however, a practical difficulty of a peculiar nature which embarrasses thesolution of the question as to the form of the cometary orbits. It so happens…
Constellations · Stars
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