Descriptive Astronomy |
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Page xxiii
... increased care bestowed on observations of the Stars.— Ideas of the Ancients on the Stars . - Remarks by Sir J. Herschel . CHAPTER II . DOUBLE STARS , ETC. 462-74 But few known until Sir W. Herschel commenced his search for them ...
... increased care bestowed on observations of the Stars.— Ideas of the Ancients on the Stars . - Remarks by Sir J. Herschel . CHAPTER II . DOUBLE STARS , ETC. 462-74 But few known until Sir W. Herschel commenced his search for them ...
Page 36
... increases . Connected with the distances of the planets Bode of Berlin in 1778 published the following singular " law " of the numerical relations existing between them , which , although not discovered by him but by Titius of ...
... increases . Connected with the distances of the planets Bode of Berlin in 1778 published the following singular " law " of the numerical relations existing between them , which , although not discovered by him but by Titius of ...
Page 51
... increases , and its form becomes gibbous , and ultimately circular when in superior conjunction ; at this point the planet is lost in the Sun's rays , and is invisible . On emerging therefrom the gibbous form is still apparent , but the ...
... increases , and its form becomes gibbous , and ultimately circular when in superior conjunction ; at this point the planet is lost in the Sun's rays , and is invisible . On emerging therefrom the gibbous form is still apparent , but the ...
Page 72
... increases it in the quadratures , increasing or diminishing the Moon's mean longitude by 1 ° 20 ' . Period , about 31a 19h 30m . Discovered by Ptolemy , but previously suspected by Hipparchus . 2. The variation depends solely on the ...
... increases it in the quadratures , increasing or diminishing the Moon's mean longitude by 1 ° 20 ' . Period , about 31a 19h 30m . Discovered by Ptolemy , but previously suspected by Hipparchus . 2. The variation depends solely on the ...
Page 73
... increased at the rate of rather more than 10 " every 100 years . This inequality was detected by Halley in 1693 from a comparison of the periodic time of the Moon , deduced from Chaldæan obser- vations of eclipses , made at Babylon in ...
... increased at the rate of rather more than 10 " every 100 years . This inequality was detected by Halley in 1693 from a comparison of the periodic time of the Moon , deduced from Chaldæan obser- vations of eclipses , made at Babylon in ...
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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...