Rudimentary AstronomyJohn Weale, 1852 - 156 Seiten |
Inhalt
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61 Cygni aberration accuracy accurately angular distance aphelion apogee apparent apse astronomers axis calculated comet computed correction curve describe determined diameter direction discovery disk disturbing force diurnal diurnal motion earth's orbit earth's surface ecliptic effect elements elliptic orbit equal equator equatorial equinox error evection excentricity fixed geocentric gravitation Greenwich heavens Hence Herschel horizontal inclination increase inequalities instrument Jupiter Kepler's known latitude line of apsides longitude lunar orbit mean anomaly mean distance mean motion measured micrometer moon moon's moving mural circle nearly node nutation object object-glass observations Observatory parallax perigee perihelion period planet planetary polar distance pole position precession proportion quadrature quantity radius vector reader refraction revolution revolve right angles right ascension rotation round the sun satellites sidereal solar orbit space stars sun's supposed syzygy telescope tion transit transit of Venus true anomaly true longitude velocity Venus vertical wire zenith distances
Beliebte Passagen
Seite 130 - On the other hand, in the regions beneath the dark side, a solar eclipse of fifteen years in duration, under their shadow, must afford (to our ideas) an inhospitable asylum to animated beings, ill compensated by the faint light of the satellites. But we shall do wrong to judge of the fitness or unfitness of their condition from what we see around us, when, perhaps, the very combinations which convey to our minds only images of horror, may be in reality theatres of the most striking and glorious displays...
Seite 55 - Every particle of matter, at a sensible distance, attracts every other particle with a force varying inversely as the square of the distance.
Seite 29 - ... since the altitude of the pole is equal to the latitude of the place (art.
Seite 76 - If it be continued ti , it intersect the ecliptic, it will show nearly the place of the node and the inclination of the orbit to the ecliptic."* There is, however, a practical difficulty which Fig.
Seite 154 - ... inches of reflecting aperture, up to perfectly separated stars like the milky way, and clustering groups sufficiently insulated and condensed to come under the designation of irregular, and in some cases pretty rich clusters. But besides...
Seite 86 - ... at some considerably lower level within its depth,) a cloudy stratum which, being strongly illuminated from above, reflects a considerable portion of the light to our eyes, and forms a penumbra, while the solid body, shaded by the clouds, reflects none.
Seite 68 - ... the resistance of the air (varying as the square of the velocity) would so instantaneously and enormously diminish it, as to render it useless.
Seite 140 - ... and resembled a perfectly pure white cloud, without any variation, except a slight change near the head, just sufficient to distinguish the nucleus from the tail at that point.
Seite 154 - But, besides these, there are also nebulae in abundance, both regular and irregular; globular clusters in every state of condensation; and objects of a nebulous character quite peculiar, and which have no analogue in any other region of the heavens.
Seite 101 - ... Moon, it will necessarily come between the Earth and the Sun, and the 3 bodies will be in the same straight line ; it will therefore follow that to certain parts of the Earth the Sun's disc will be obscured, wholly or partially as the case may be : this is an Eclipse of the Sun. In the figures above, S represents the Sun, E the Earth, and M the Moon. In a total eclipse the Moon's shadow reaches to the Earth, the Moon being more or less in a perigean position.