Descriptive Astronomy |
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Page 2
... given , it is not difficult to determine , by simple trigonometry , the Sun's distance , expressed in radii of the Earth , reducible thereafter to miles . Professor Encke , of Berlin , executed an able discussion of the observations of ...
... given , it is not difficult to determine , by simple trigonometry , the Sun's distance , expressed in radii of the Earth , reducible thereafter to miles . Professor Encke , of Berlin , executed an able discussion of the observations of ...
Page 12
... given . A spot measured by Pastorff on May 24 , 1828 , was computed to have an area about four times the entire surface of the Earth , In a Month . Not . R. A. S. , vol . xix . p . 182 . The preceding facts are given on the authority of ...
... given . A spot measured by Pastorff on May 24 , 1828 , was computed to have an area about four times the entire surface of the Earth , In a Month . Not . R. A. S. , vol . xix . p . 182 . The preceding facts are given on the authority of ...
Page 18
... given in Month . Not . R.A.S. , vol . xxi . p . 77 . h Phil . Trans . , vol . xci . p . 316. 1801 . i Op . cit . k Bibl . Univ . de Genève , vol . li . p . 56 . 1844 . apparent activity to prevail annually on the average of months 18 ...
... given in Month . Not . R.A.S. , vol . xxi . p . 77 . h Phil . Trans . , vol . xci . p . 316. 1801 . i Op . cit . k Bibl . Univ . de Genève , vol . li . p . 56 . 1844 . apparent activity to prevail annually on the average of months 18 ...
Page 20
... given out by different parts of the surface of the Sun are also of unequal power , but , unlike the rays of light , they do not vary regularly from centre to edge . As regards the rays of heat , these likewise are radiated more from the ...
... given out by different parts of the surface of the Sun are also of unequal power , but , unlike the rays of light , they do not vary regularly from centre to edge . As regards the rays of heat , these likewise are radiated more from the ...
Page 43
... given them . More accurate ideas were , however , current , but found THE PTOLEMAIC SYSTEM . few supporters . Aristarchus of Samos , who lived about 280 B.C. , supposed , according to Archimedes and Plutarch , that the Earth revolved ...
... given them . More accurate ideas were , however , current , but found THE PTOLEMAIC SYSTEM . few supporters . Aristarchus of Samos , who lived about 280 B.C. , supposed , according to Archimedes and Plutarch , that the Earth revolved ...
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Common terms and phrases
angle angular apparition April Arago astronomers atmosphere axis bright Cassini Cassiopeia Catalogue centre circle cluster colour comet appeared comet was seen constellation Dawes Decl diameter disc discovered discovery double stars Earl of Rosse Earth eclipse Encke epoch equator equatorial equinox eye-piece globular cluster Halley's comet heavens Herculis Herschel Hind hour Hydræ inches inferior conjunction inferior planets instrument John Herschel July June Jupiter Lassell Leonis light longitude lunar Ma-tuoan-lin Mädler Mailla March Mars mean distance Mercury meridian meteors miles minor planets Month Moon Moon's motion naked eye nebula node object orbit parallax passed perihelion period Phil Pingré planet proper motion refraction remarkable right ascension ring rotation satellites Saturn Schröter Sept shew sidereal solar spots star otherwise called Sun's surface tail telescope Trans transit Uranus Ursa Venus visible weeks ΙΟ
Popular passages
Page 315 - For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God...
Page 314 - So spake the grisly terror ; and in shape, So speaking, and so threatening, grew ten-fold More dreadful and deform : on the other side, Incensed with indignation, Satan stood Unterrified, and like a comet burned, That fires the length of Ophiuchus huge In the Arctic sky, and from his horrid hair Shakes pestilence and war.
Page 452 - In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.
Page 66 - While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Page 31 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Page 795 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Page 184 - I did not remark 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.
Page 244 - ... properly adjusted at every instant to that of the ball, while preserving its inclination to the horizon, so that when the ball in its natural descent reached C, the tube should have been carried into the position...
Page 124 - Saturn, perhaps, devoured his children ? Or were the appearances indeed illusion or fraud, with which the glasses have so long deceived me as well as many others to whom I have shown them...