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 . 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 . 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
accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS