Τι λένε οι χρήστες - Σύνταξη κριτικής
Δεν εντοπίσαμε κριτικές στις συνήθεις τοποθεσίες.
Άλλες εκδόσεις - Προβολή όλων
annual appear approach astronomers atmosphere attraction axis balloon become bodies called cause celestial changes circle clouds comets consequence continued course dark diameter difference diminishes direction discovered distance diurnal divided earth east eclipse effect entirely equal equator face fall feet fixed force four give greater half happens heat heavens height Hence Herschel horizon hundred increased Jupiter known latitude length less light manner matter means miles millions minutes months moon motion move names nearly never night objects observations once orbit passes period planets pole portion position present probable produce proportion quantity rays reach refraction represented respect revolution revolve rise round Saturn seasons seen shadow shines side signs situated solar system sometimes space stars sun's supposed surface telescope thousand tion turned twelve visible whole wind
Σελίδα 238 - ... The wind raised the fine sand with which the extensive desert was covered, so as to fill the atmosphere, and render the immense space before us impenetrable to the eye beyond a few yards. The sun and clouds were entirely obscured, and a suffocating and oppressive weight accompanied the flakes and masses of sand, which, I had almost said, we had to penetrate at every step. At times we completely lost sight of the camels, though only a few yards before us.
Σελίδα 91 - The sun's rays are the ultimate source of almost every motion which takes place on the surface of the earth. By its heat are produced all winds, and those disturbances in the electric equilibrium of the atmosphere which give rise to the phenomena of lightning, and probably also to those of terrestrial magnetism and the aurora.
Σελίδα 64 - Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Σελίδα 238 - Eleven of them ranged alongside of us, about the distance of three miles. The greatest diameter of the largest appeared to me at that distance as if it would measure ten feet. They retired from us with a wind at SE, leaving an impression upon my mind to which I can give no name, though surely one ingredient in it was fear, with a considerable deal of wonder and astonishment.
Σελίδα 119 - 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...
Σελίδα 119 - Mercury will be represented by a grain of mustard seed, on the circumference of a circle 164 feet in diameter for its orbit ; Venus a pea, on a circle of 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 ; the Asteroids, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
Σελίδα 154 - Sirius, would require to be removed to 141,400 times its actual distance. We have seen, however, that the distance of Sirius cannot be so small as 200,000 times that of the sun. Hence it follows that, upon the lowest possible computation, the light really thrown out by Sirius cannot be so little as double that emitted by the sun ; or that Sirius must, in point of intrinsic splendour, be at least equal to two suns, and is, in all probability, vastly greater.
Σελίδα 112 - There is not perhaps another object in the heavens that presents us with such a variety of extraordinary phenomena as the planet Saturn ; a magnificent globe, encompassed by a stupendous double ring ; attended by seven satellites ; ornamented with equatorial belts ; compressed at the poles ; turning upon its axis ; mutually eclipsing its ring and satellites, and eclipsed by them ; the most distant of the rings also turning upon its axis, and the same taking place with the farthest of the satellites...
Σελίδα 130 - Twins, the Crab, the Lion, the Virgin, the Scales, the Scorpion, the Archer, the Goat, the Waterer, and the Fishes. Fig. 183. The 12 signs of the zodiac, together with the sun, and the earth revolving around him, are represented at fig.