Popular astronomy. From 'The museum of science and art'. |
Загальні терміни та фрази
2mar altitude angular aphelion apparent magnitude apparent semi-diameters ascertained ascribed Astronomer Royal astronomers atmosphere attraction axis azimuth azimuth circle Baily's beads bodies brightness calculated celestial centre Chap colour coma comet appeared cometary conical consequently dark direction disc disturbing action diurnal motion earth edge effects Electric Telegraph elliptic orbit Engelholm epoch equal gravitation greater HALLEY'S COMET Hand-Book of Astronomy Harmattan head HELIOMETER illuminated increased influence instrument interval Jupiter less light luminous lunar LUNAR ECLIPSES magnitude mass mean distance millions of miles moon moon's limb motion of rotation move MUSEUM OF SCIENCE nearly nebulous number of comets object Observatory observed passed path perihelion period phenomena phenomenon planets point of reference position produced rays render revolve right ascension ring round the sun seen shadow solar eclipse solar system space star sun's supposed surface tail telescope terrestrial tion total obscuration transit circle tube velocity vertical visible
Популярні уривки
Сторінка 27 - POPULAR ASTRONOMY. Containing How to Observe the Heavens. The Earth, Sun, Moon, Planets. Light, Comets, Eclipses, Astronomical Influences, &c. 182 Illustrations, 4*. 6d. THE BEE AND WHITE ANTS: Their Manners and Habits. With Illustrations of Animal Instinct and Intelligence.
Сторінка 166 - I did not notice any beams projecting from it which deserved notice as much more conspicuous than the others, but the whole was beamy, radiated in structure, and terminated — though very indefinitely — in a way which reminded me of the ornament frequently placed round a mariner's compass. Its colour was white, or resembling that of Venus. I saw no flickering or unsteadiness of light. It was not separated from the moon by any dark ring, nor had it any annular structure. It looked like a radiated...
Сторінка 28 - Whether we consider the liberality and beauty of the illustrations, the charm of the writing, or the durable interest of the matter, we must express our belief that there is hardly to be found among...
Сторінка 176 - ... consequently that the comet ought not to be expected to appear until the end of 1758, or the beginning of 1759. It is impossible to imagine any quality of mind more enviable than that which, in the existing state of mathematical physics, could have led to such a prediction. The imperfect state of mathematical science rendered it impossible for Halley to offer to the world a demonstration of the event which he foretold. " He therefore,
Сторінка 179 - Lepaute was such, that without her we never should have dared to undertake the enormous labour, in which it was necessary to calculate the distance of each of the two planets, Jupiter and Saturn, from the comet, separately for every degree, for one hundred and fifty years.
Сторінка 12 - The side-walls, 12 feet distant from the tube, are 72 feet in length, 48 feet in height on the outside, and 56 feet in the inside. These walls are built in the plane of the meridian. The observer stands in one or other of four galleries, the three highest of which are drawn out from the western wall, while the fourth or lowest has for its base an elevating platform, along the surface of which a gallery is moved from wall to wall by a mechanism at the command of the observer.
Сторінка 146 - For the civil and political historian the past alone has existence, the present he rarely apprehends, the future never. To the historian of science it is permitted, however, to penetrate the depths of past and future with equal clearness and certainty ; facts to come are to him as present, and not unfrequently more assured than facts which are past. Although this clear perception of causes and consequences characterizes the whole domain of physical science, and clothes the natural philosopher with...
Сторінка 146 - Governor" of the world, in His inscrutable wisdom, to baffle our inquiries into the nature and the proximate cause of that wonderful faculty of intellect— that image of His own essence which He has conferred upon us ; nay, the springs and wheelwork of animal and vegetable vitality are concealed from our view by an impenetrable veil, and the pride of philosophy is humbled by the spectacle of the physiologist bending in fruitless ardour over the dissection of the human brain, and peering in equally...
Сторінка 206 - Young, — a theory which, if not founded in nature, is certainly one of the happiest fictions that the genius of man has yet invented to group together natural phenomena, as well as the most fortunate in the support it has unexpectedly received from whole classes of new phenomena, which at their first discovery seemed in irreconcileable opposition to it.
Сторінка 146 - Although this clear perception of causes and consequences characterises the whole domain of physical science, and clothes the natural philosopher with. powers denied to the political and moral inquirer, yet foreknowledge is eminently the privilege of the astronomer. Nature has raised the curtain of futurity, and displayed before him the succession of her decrees, so far as they...