## History of Astronomy |

### From inside the book

Results 1-3 of 18

Page 19

Halley , in 1693 ,

discovered the acceleration of the moon ' s mean motion . This was conclusively

established , but could not be explained by the Newtonian theory for quite a long

time ...

Halley , in 1693 ,

**compared**this value with his own measurements , and sodiscovered the acceleration of the moon ' s mean motion . This was conclusively

established , but could not be explained by the Newtonian theory for quite a long

time ...

Page 42

All of the best theories were

cautiously with his propositions until he arrives at his great laws , and he

concludes his book by

theory .

All of the best theories were

**compared**by him with observation . ... He proceedscautiously with his propositions until he arrives at his great laws , and he

concludes his book by

**comparing**observations of Mars , of all dates , with histheory .

Page 44

And the observation of Tycho gives the direction of Mars

SE , M . So all the angles of the triangle SEM in any of these positions of E are

known , and also the ratios of SE , SE , , SE , SE , to SM and to each other . For

the ...

And the observation of Tycho gives the direction of Mars

**compared**with the sun ,SE , M . So all the angles of the triangle SEM in any of these positions of E are

known , and also the ratios of SE , SE , , SE , SE , to SM and to each other . For

the ...

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### Contents

ANCIENT GREEK ASTRONOMY | 3 |

GALILEO AND THE TELESCOPENOTIONS OF GRAVITY | 46 |

NEWTONS SUCCESSORS HALLEY EULER | 60 |

### Other editions - View all

### 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