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angle angular aphelion appear ascending node Asteroids astronomers attraction axis called Capricornus cause centre Ceres circle color comets constellation declination degrees diameter direction disc distance double star earth ecliptic equator equinoctial equinox figure fixed stars follows globe heavens Herschel inferior conjunction interior planet John Herschel Juno Jupiter largest star learner Lesson longitude lunar Mars miles moon moon's orbit motion naked eye nearly nebulae observed opposite Pallas pass perihelion periodic revolution planetary planets polar inclination poles primary planets principal stars represented respecting RETROGRADE MOTIONS revolve right ascension rings satellites Saturn seasons second magnitude secondary planets seen shadow side sidereal small stars solar bodies Solar System sphere spring tides sun and moon sun's supposed surface synodic tails Taurus telescope theory third magnitude tide-wave tion transits transits of Mercury velocity Verrier Vesta visible west to east Zodiac Zodiacal Light
Page 163 - He telleth the number of the stars, and calleth them all by their names.
Page 216 - The PRIME VERTICAL is that azimuth circle which passes through the east and west points of the horizon, and is always at right angles...
Page 189 - This remarkable law of variation certainly appears strongly to suggest the revolution round it of some opaque body, which, when interposed between us and Algol, cuts off a large...
Page 208 - Day, (astronomical,) the time between two successive transits of the sun's centre over the same meridian, which always begins and ends at noon.
Page 91 - We see it as Columbus saw America from the shores of Spain. Its movements have been felt, trembling along the far-reaching line of our analysis, with a certainty hardly inferior to that of ocular demonstration.
Page 192 - As to those stars which suddenly shine forth with a very vivid light, and then immediately disappear, it is extremely probable that great conflagrations, produced by extraordinary causes, take place on their surface. This conjecture is confirmed by their change of colour, which is analogous to that presented to us on the earth by those bodies which are set on fire and then gradually extinguished.
Page 200 - It is small, and particularly well defined, so as in fact to have much more the appearance of a flat oval solid ring than of a nebula. The axes of the ellipse are to each other in the proportion of about 4 to 5, and the opening occupies about half...
Page 200 - They have, as their name imports, exactly the appearance of planets : round or slightly oval discs, in some instances quite sharply terminated, in others a little hazy at the borders, and of a light exactly equable or only a very little mottled, which, in some of them, approaches in vividness to that of actual planets.
Page 153 - Sun in one of the foci, its rate of motion will be unequal in different parts of its orbit — swiftest at perihelion, and slowest at aphelion. From perihelion to aphelion the centripetal more directly counteracts the centrifugal force, and the planet is retarded. On the other hand, from the aphelion to the perihelion point, the centripetal and centrifugal forces are united, or act in a similar direction.