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accurate Almagest angle appear ascertained asteroids astronomers atmosphere average axis binary bright catalogue celestial century CHAPTER comet Copernicus corona dark diameter discovery disk distance Draper earth evolution existence eyepiece faint fainter feet Galactic Galaxy Galileo globular clusters gravitation Halley heat heavens Herschel Hipparchus hypothesis instruments investigation Jupiter Kapteyn Kepler known length Lick Observatory light lines lunar magnitude Mars mass mathematical measured Mercury meteors method Milky million miles moon moon's Mount Wilson nearly Neptune Newton objects observations Observatory optical orbit original parallax parsecs passed period photographic planet planetary planetesimal plate polar proper motions Ptolemy radial velocities radiation reflector regions ring rotation round the sun satellites Saturn seen solar system space spectra spectral type spectroscopic spectrum spiral nebulae star's sun spots sun's surface telescope temperature theory tion total eclipse Tycho Uranus variable stars vast Venus visible Yerkes Yerkes Observatory
Page 210 - Less than archangel ruined, and the excess Of glory obscured ; as when the sun, new risen, Looks through the horizontal misty air Shorn of his beams, or from behind the moon, In dim eclipse, disastrous twilight sheds On half the nations, and with fear of change Perplexes monarchs.
Page 162 - Venus a pea, on a circle 284 feet in diameter; the Earth also a pea, on a circle of 430 feet; Mars a rather large pin's head, on a circle of 654 feet...
Page 252 - The sun, viewed in this light, appears to be nothing else than a very eminent, large, and lucid planet, evidently the first, or, in strictness of speaking, the only primary one of our system ; all others being truly secondary to it.
Page 66 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 14 - All this was in the two plague years of 1665 and 1666, for in those days I was in the prime of my age for invention, and minded mathematics and philosophy more than at any time since.
Page 163 - ... feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half, and Neptune a good-sized plum on a circle about two miles and a half in diameter.
Page 336 - Trans. 1828) ; but it is from the observations of Sir John Herschel, at the Cape, that the knowledge of its splendid character is derived. That astronomer pronounces it, beyond all comparison, the richest and largest object of the kind in the heavens.
Page 273 - Threatening the world with famine, plague, and war ; To princes, death ; to kingdoms, many curses ; To all estates, inevitable losses ; To herdsmen, rot ; to ploughmen, hapless seasons ; To sailors, storms ; to cities, civil treasons.
Page 384 - Only the inertia of tradition keeps the contraction hypothesis alive — or rather, not alive, but an unburied corpse. But if we decide to inter the corpse, let us freely recognise the position in which we are left. A star is drawing on some vast reservoir of energy by means unknown to us. This reservoir can scarcely be other than the sub-atomic energy which, it is known, exists abundantly in all matter; we sometimes dream that man will one day learn to release it and use it for his service.