Contrasts of these planetary
groups. Relations of distance from one central body. Differences of
absolute magnitude, density, period of revolution, eccentricity, and
inclination of the orbits. The so-called law of the distances of the
planets from their central sun. The planets which have the largest number
of moons -- p. 96 and note. Relations in space, both absolute and relative,
of the secondary planets. Largest and smallest of the moons. Greatest
approximation to a primary planet. Retrogressive movement of the moons of
Uranus. Libration of the Earth's satellite -- p. 98 and note. Comets; the
nucleus and tail; various forms and directions of the emanations in conoidal
envelopes, with more or less dense walls. Several tails inclined toward the
sun; change of form of fixed stars by the nuclei of comets. Eccentricity of
their orbits and periods of revolution. Greatest distance and greatest
approximation of comets. Passage through the system of Jupiter's
satellites. Comets of short periods of revolution, more correctly termed
inner comets (Encke, Biela, Faye) -- p. 107 and note. Revolving aerolites
(meteoric stones, fire-balls, falling stars). Their planetary velocity,
magnitude, form, observed height. Periodic return in streams; the November
stream and the stream of St.
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