A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 215
may be considered as Qtjestions.—30T. What are comets? 308. Of what parts do they consist? a.Origin of the name b. Is the appearance of a comet uniform ? c. How distinguishedfrom planets ? 809. In what kind of orbits do they revolve ? 210 COMETS belongings to the solar system; the others, only as… … ORBITS OF COMETS. a. These paths are curve lines of peculiar properties; they are called conic sections, because they may be formed by cutting a cone inVarious ways. Thus, if a cone be cut by a plane parallel to its basethe curve formed will be a circle; if both sides of the cone be cutobliquely by…
Astronomy
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