History of Astronomy |
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Page 22
He adopted the excentric and equant of Hipparchus to explain the unequal
motions of the sun and moon . ... We , who know that the earth revolves round the
sun once in a year , can understand that the apparent motion of a planet is only
its ...
He adopted the excentric and equant of Hipparchus to explain the unequal
motions of the sun and moon . ... We , who know that the earth revolves round the
sun once in a year , can understand that the apparent motion of a planet is only
its ...
Page 129
motions and parallaxes combined tell us the velocity of the motion of these stars
across the line of sight : a Centauri 14 . 4 miles a second = 4 . 2 astronomical
units a year ; 61 Cygni 37 . 9 miles a second = 11 . 2 astronomical units a year .
motions and parallaxes combined tell us the velocity of the motion of these stars
across the line of sight : a Centauri 14 . 4 miles a second = 4 . 2 astronomical
units a year ; 61 Cygni 37 . 9 miles a second = 11 . 2 astronomical units a year .
Page 130
The same has been proved for proper motion , and line of sight motion , in the
case of Pleiades and other groups . Maskelyne measured many proper motions
of stars , from which W . Herschel : came to the conclusion that these apparent ...
The same has been proved for proper motion , and line of sight motion , in the
case of Pleiades and other groups . Maskelyne measured many proper motions
of stars , from which W . Herschel : came to the conclusion that these apparent ...
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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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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 |