Electro Astronomical Atlas: ... with Explanatory Notes, Questions and AnswersWeed, Parsons, 1874 - 96 σελίδες |
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61 Cygni A.TOLLE ALBANY ANALYSIS angle Aphelion appearance astronomers Attraction and Repulsion axis brilliant called causes Ceres Comet compared conjunction Constellation dark degrees Diagram diameter difference disc discovered distinguished diurnal motion Earth Earth's orbit Ecliptic electricity equator Equinoctial Equinox Fixed Stars Full Moon Galvanic Goldschmidt greatest cold heavens Hemisphere hence Herschel horizon hundred Inclination of Orbit John Herschel Juno Jupiter length LESSON light luminous Mars mean distance Mercury meteors miles an hour million miles Minor Planets minutes mountains nearly negative Neptune night North Pole nucleus observed opposite orbit PARSONS passes penumbra Perihelion period PHOTO-LITH polar circle positive present rate of motion revolution revolve ring rotation satellites Saturn seen shadow situated SOLAR PROMINENCES Solar System Solstice spots surface telescope Terrestrial Magnetism thousand miles tion transit umbra Uranus Venus Vernal Equinox Vesta WEED west to east Zodiac Zodiacal Light
Δημοφιλή αποσπάσματα
Σελίδα 17 - That changed through all, and yet in all the same, Great in the earth as in the ethereal frame, Warms in the sun, refreshes in the breeze, Glows in the stars, and blossoms in the trees : Lives through all life, extends through all extent, Spreads undivided, operates unspent...
Σελίδα 25 - The inclination of the Earth's axis to the plane of the ecliptic causes the equinoctial to depart 23° 28
Σελίδα 13 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Σελίδα 74 - ... of November. Those particles which come in contact with the earth, or approach so near as to be attracted into its atmosphere, become ignited, and appear as falling stars. As the earth encounters the comet's tail, or meteoric shower, for three successive years at the same place, we must conclude the comet's track to have the enormous length of 1,772,000,000 of miles. In Fig.
Σελίδα 74 - It was only in its last revolution, in the year 1866, that this meteoric cloud, now forming part of our solar system, was first seen as a comet. The orbit of this comet is much smaller than that of the August meteors, extending at the aphelion as far as the orbit of Uranus, while the perihelion is nearly as far from the sun as our earth. The comet completes its revolution in about...
Σελίδα 34 - ... elevation, limit the view. Out at sea, the circular form of the horizon is still more decided, and changes only near the coasts, the outline of which breaks the regularity. Here, then, we obtain a first notion of the rotundity of the Earth, since a sphere is the only body which is presented always to us under the form of a circle, from whatever exterior point of view it is examined. Moreover, it cannot be said that the horizon is formed by the limit of distinct...
Σελίδα 74 - January 126, and passed so near the planet Uranus as to be brought by its attraction into an elliptic orbit round the sun. This orbit is the same as that of the comet discovered by Tempel, and calculated by Oppolzer, and is identical with that in which the November group of meteors make their revolution. Since that time, this cosmical cloud, in the form of a comet, has completed fifty-two revolutions round the sun, without its existence being otherwise made known than by the loss of an immense number...
Σελίδα 34 - The curvature of the surface of the sea manifests itself in a still more striking manner. Suppose yourself on the coast, at the summit of a high tower, hill, or steep, rocky shore ; a vessel appears on the horizon, you see only the tops of the masts, the highest sails ; the lower sails and the hull are invisible. As the vessel approaches, its lower part comes into view above the horizon, and soon it appears entire (fig.
Σελίδα 57 - ... of the terrestrial density. It is a third more than that of water; it is easy to conjecture that the strata forming the surface have, at most, the density of water. Is the surface of Jupiter, then, in a liquid state ? Here observations fail us. Four luminous points — four small stars — unceasingly accompany Jupiter in its twelve-yearly revolution. They are easily observed with small telescopes. From hour to hour their positions vary, and they seem to oscillate from one side to the other of...
Σελίδα 74 - November shower, and have found it in the small comet of 1866, No. I., first observed by Tempel, of Marseilles. Its transformation into a ring of meteors has not proceeded nearly so far as that of the comet of 1862, No. III. Its existence is of a much more recent date ; and therefore the dispersion of the meteoric particles along the orbit, and the consequent formation of the ring, is but slightly developed. According to Le Verrier, a cosmical nebulous cloud entered our system in January...