History of Astronomy |
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Page 18
The line from the earth to the “ excentric ” was called the line of apses . A circle
having this centre was called the equant , and he supposed that a radius drawn
to the sun from the excentric passes over equal arcs on the equant in equal times
.
The line from the earth to the “ excentric ” was called the line of apses . A circle
having this centre was called the equant , and he supposed that a radius drawn
to the sun from the excentric passes over equal arcs on the equant in equal times
.
Page 42
His second law ( a far more difficult one to prove ) states that a line drawn from a
planet to the sun sweeps over equal areas in equal times . These two laws were
published in his great work , Astronomia Nova , seu Physica Cælestis tradita ...
His second law ( a far more difficult one to prove ) states that a line drawn from a
planet to the sun sweeps over equal areas in equal times . These two laws were
published in his great work , Astronomia Nova , seu Physica Cælestis tradita ...
Page 135
From this it has been calculated that the mass of Sirius equals two of our suns ,
and its intrinsic brightness equals twenty suns ; but the companion , having a
mass equal to our sun , has only a five - hundredth part of the sun ' s brightness .
From this it has been calculated that the mass of Sirius equals two of our suns ,
and its intrinsic brightness equals twenty suns ; but the companion , having a
mass equal to our sun , has only a five - hundredth part of the sun ' s brightness .
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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 |