History of Astronomy |
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Page 129
Proper Motion . - In 1718 Halley 2 detected the proper motions of Arcturus and
Sirius . In 1738 J . Cassini 3 showed that the former had moved five minutes of
arc since Tycho Brahe fixed its position . In 1792 Piazzi noted the motion of 61
Cygni ...
Proper Motion . - In 1718 Halley 2 detected the proper motions of Arcturus and
Sirius . In 1738 J . Cassini 3 showed that the former had moved five minutes of
arc since Tycho Brahe fixed its position . In 1792 Piazzi noted the motion of 61
Cygni ...
Page 130
It has often been noticed that stars which seem to belong to a group of nearly
uniform magnitude have the same proper motion . The spectroscope has shown
that these have also often the same velocity in the line of sight . Thus in the Great
...
It has often been noticed that stars which seem to belong to a group of nearly
uniform magnitude have the same proper motion . The spectroscope has shown
that these have also often the same velocity in the line of sight . Thus in the Great
...
Page 131
The average proper motion of a first magnitude star has been found to be o " . 25
annually , and of a sixth magnitude star o " . 04 . But that all bright stars are
nearer than all small stars , or that they show greater proper motion for that
reason , is ...
The average proper motion of a first magnitude star has been found to be o " . 25
annually , and of a sixth magnitude star o " . 04 . But that all bright stars are
nearer than all small stars , or that they show greater proper motion for that
reason , is ...
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Contents
ANCIENT GREEK ASTRONOMY | 3 |
GALILEO AND THE TELESCOPENOTIONS OF GRAVITY | 46 |
NEWTONS SUCCESSORS HALLEY EULER | 60 |
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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 light lunar Mars mass mathematical mean measured method miles moon moon's motion move nebulæ Newton noted 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 solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY
Bibliographic information
| Title | History of Astronomy The history of science series |
| Author | George Forbes |
| Publisher | Watts, 1921 |
| Original from | Indiana University |
| Digitized | 5 Aug 2010 |
| Length | 150 pages |
| Export Citation | BiBTeX EndNote RefMan |