History of Astronomy |
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Page 56
... velocity in free space , subject only to a central force , varying inversely as the square of the distance , the body must revolve in a curve which may be any one of the sections of a cone — a circle , ellipse , parabola , or hyperbola ...
... velocity in free space , subject only to a central force , varying inversely as the square of the distance , the body must revolve in a curve which may be any one of the sections of a cone — a circle , ellipse , parabola , or hyperbola ...
Page 78
... velocity is 186,000 miles per second . In 1681 he took up his duties as astronomer at Copenhagen , and built the first transit circle on a window - sill of his house . The iron axis was five feet long and one and a - half inches thick ...
... velocity is 186,000 miles per second . In 1681 he took up his duties as astronomer at Copenhagen , and built the first transit circle on a window - sill of his house . The iron axis was five feet long and one and a - half inches thick ...
Page 85
... velocity to the velocity of light . The velocity of light is 186,000 miles a second ; whence the distance to the sun is 92,780,000 miles . There seems , however , to be some uncertainty about the true value of the aberration , any ...
... velocity to the velocity of light . The velocity of light is 186,000 miles a second ; whence the distance to the sun is 92,780,000 miles . There seems , however , to be some uncertainty about the true value of the aberration , any ...
Page 92
... velocity of approach or recession . Everyone has noticed on a railway that , on meeting a locomotive whistling , the note is lowered after the engine has passed . The pitch of a sound or the colour of a light depends on the number of ...
... velocity of approach or recession . Everyone has noticed on a railway that , on meeting a locomotive whistling , the note is lowered after the engine has passed . The pitch of a sound or the colour of a light depends on the number of ...
Page 103
... velocity of motion thus indicated in the line of sight sometimes appears to amount to 320 miles a second . But it must be remembered that pressure of a gas has some effect in displacing the spectral lines . So we must go on , collecting ...
... velocity of motion thus indicated in the line of sight sometimes appears to amount to 320 miles a second . But it must be remembered that pressure of a gas has some effect in displacing the spectral lines . So we must go on , collecting ...
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Common terms and phrases
accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith