An Elementary Astronomy for Academies and Schools: Illustrated by Numerous Original Diagrams and Adapted to Use Either with Or Without the Author's Large Maps |
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Common terms and phrases
angle angular aphelion apparent magnitude appear ascending node Asteroids Astræa astronomers axis called cause celestial longitude centre Ceres circle color comets constellation degrees diameter direction disc distance earth ecliptic elongation equator equinoctial equinox figure fixed stars follows full moon globe heavens hemisphere Herschel inferior conjunction interior planet Juno Jupiter Le Verrier learner Lesson light and heat longitude lunar magnitude MAP ILLUSTRATES Mars Mercury and Venus miles moon moon's orbit motion nearly nebulæ night observed opposite Pallas pass perihelion periodic revolution planetary planets polar inclination poles primary planets principal stars represented respecting retrograde RETROGRADE MOTIONS revolve right ascension rings satellites Saturn seasons secondary planets seen shadow side sidereal solar bodies solar spots Solar System solstice sphere spring tides sun and moon supposed surface synodic tails theory tide-wave tion transits velocity Verrier Vesta visible west to east Zodiac Zodiacal Light
Popular passages
Page 160 - Canst thou bind the sweet influences of Pleiades, or loose the bands of Orion? Canst thou bring forth Mazzaroth in his season? or canst thou guide Arcturus with his sons?
Page 210 - 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 148 - The radius vector (line joining the centre of the sun with the centre of the planet) of each planet sweeps over equal areas in equal times. (3) The squares of the periodic times (the periods of complete revolution round the sun) of nnv planets are proportional to the cubes of their mean distances from the sun.
Page 183 - 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 181 - In such instances, the larger star is usually of a ruddy or orange hue, while the smaller one appears blue or green, probably in virtue of that general law of optics, which provides that, when the retina is under the influence of excitement by any bright, colored light ; feebler lights, which seen alone would produce no sensation but of whiteness, shall for the time appear colored with the tint complementary to that of the brighter.
Page 149 - On it place a globe, two feet in diameter; this will represent the Sun; 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 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...
Page 181 - Thus a yellow colour predominating in the light of the brighter star, that of the less bright one in the same field of view will appear blue ; while, if the tint of the brighter star verge to crimson, that of the other will exhibit a tendency to green — or even appear as a vivid green, under favourable circumstances.
Page 182 - ... a red and a green, or a yellow and a blue one — must afford a planet circulating about either; and what charming contrasts and "grateful vicissitudes," — a red and a green day, for instance, alternating with a white one and with darkness, — might arise from the presence or absence of one or other, or both, above the horizon.
Page 181 - It is by no means, however, intended to say, that in all such cases one of the colours is a mere effect of contrast, and it may be easier suggested in words, than conceived in imagination, what variety of illumination two suns — a red and a green, or a yellow and a blue one — must afford a planet circulating about either ; and what charming contrasts and