## History of Astronomy |

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Page 55

But improved mathematical

the seeming doubt has been converted into ... He invented a mathematical

diameter .

But improved mathematical

**methods**have always succeeded in the end , and sothe seeming doubt has been converted into ... He invented a mathematical

**method**which he used for computing the ratio of the polar to the equatorialdiameter .

Page 62

This led Euler to write a valuable essay disclosing a new

perturbations , called the instantaneous ellipse with variable elements . The

the ...

This led Euler to write a valuable essay disclosing a new

**method**of computingperturbations , called the instantaneous ellipse with variable elements . The

**method**was much developed by Lagrange . But again it was Laplace who solvedthe ...

Page 85

Another

the earth ' s orbital motion , giving the circumference traversed in a year , and so

the radius of the orbit . This has been done by comparing observation and ...

Another

**method**of getting the distance from the sun is to measure the velocity ofthe earth ' s orbital motion , giving the circumference traversed in a year , and so

the radius of the orbit . This has been done by comparing observation and ...

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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