Astronomy: The Science of the Heavenly BodiesHarper & Brothers, 1922 - 384 lappuses |
Citi izdevumi - Skatīt visu
Bieži izmantoti vārdi un frāzes
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 eyepiece faint fainter feet Galactic Galaxy Galileo globular clusters gravitation Halley heat heavens Herschel Hipparchus 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 optical orbit original parallax parsecs passed period photographic planet planetary planetesimal plate polar proper motions Ptolemy radial velocities radiation reflector regions revolution ring rotation round the sun satellites Saturn seen solar system space spectra spectral type spectroscopic spectroscopic binaries spectrum spiral nebulæ star's sun spots sun's surface tance telescope temperature theory tion total eclipse Tycho universe Uranus variable stars vast Venus visible Yerkes Observatory
Populāri fragmenti
210. lappuse - 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.
348. lappuse - To God's eternal house direct the way; A broad and ample road, whose dust is gold, And pavement stars, as stars to thee appear, Seen in the galaxy, that milky way Which nightly, as a circling zone, thou seest Powder'd with stars.
252. lappuse - 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.
163. lappuse - Mars a rather large pin's head, on a circle of 654 feet; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange...
162. lappuse - 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...
14. lappuse - 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.
163. lappuse - As to getting correct notions on this subject by drawing circles on paper, or, still worse, from those very childish toys called orreries, it is out of the question. To imitate the motions of the planets in the above-mentioned orbits, Mercury must describe its own diameter in 41 seconds; Venus in 4 minutes...
334. lappuse - 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.
273. lappuse - 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.
382. lappuse - 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.