History of Astronomy |
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Page 85
... done by comparing observation and experiment . The aberration of light is an
angle 20 " 48 , giving the ratio of the earth ' s velocity to the velocity of light . The
velocity of light is 186 , 000 miles a second ; whence the distance to the sun is 92
...
... done by comparing observation and experiment . The aberration of light is an
angle 20 " 48 , giving the ratio of the earth ' s velocity to the velocity of light . The
velocity of light is 186 , 000 miles a second ; whence the distance to the sun is 92
...
Page 90
century , while applying Dollond ' s discovery to make large achromatic
telescopes , studied the dispersion of light by a prism . Admitting the light of the
sun through a narrow slit in a window - shutter , an inverted image of the slit can
be thrown ...
century , while applying Dollond ' s discovery to make large achromatic
telescopes , studied the dispersion of light by a prism . Admitting the light of the
sun through a narrow slit in a window - shutter , an inverted image of the slit can
be thrown ...
Page 91
He suggested that the others were due to absorption in the sun ' s atmosphere .
Thereupon Professor J . D . Forbes pointed out that during a nearly total eclipse
the lines ought to be strengthened in the same way ; as that part of the sun ' s
light ...
He suggested that the others were due to absorption in the sun ' s atmosphere .
Thereupon Professor J . D . Forbes pointed out that during a nearly total eclipse
the lines ought to be strengthened in the same way ; as that part of the sun ' s
light ...
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Contents
Ancient GREEK ASTRONOMY | 3 |
INSTRUMENTS OF PRECISIONSIZE OF THE SOLAR | 10 |
GALILEO AND THE TELESCOPENOTIONS OF GRAVITY | 46 |
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Common terms and phrases
accepted accurate ancient appear astronomers attraction bodies born bright calculations called catalogue cause centre century circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect enabled epicycles equal error excentric explain fact fixed follow force Galileo give given gravitation heavenly heavens held Herschel Hipparchus idea included interesting invented Jupiter Kepler knowledge known later light lunar Mars mass mathematical mean measured method miles minutes moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planetary planets pole position predicted present principle progress proper proved records revolve rotation round Royal satellites says seems seen showed solar system spectroscope spectrum stars studied sun's supported supposed surface tables telescope theory tion trace true Tycho Brahe uniform universal
Bibliographic information
| Title | History of Astronomy Hist. of sci. series History of science series |
| Author | George Forbes |
| Publisher | Watts, 1909 |
| Original from | the University of California |
| Digitized | 13 Jan 2011 |
| Length | 154 pages |
| Export Citation | BiBTeX EndNote RefMan |