## History of Astronomy |

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Page 14

He determined the ratio of the sun ' s

out the

successors , Anaximander ( 610 - 547 B . c . ) and Anaximenes ( 550 - 475 B . c . )

...

He determined the ratio of the sun ' s

**diameter**to its orbit , and apparently madeout the

**diameter**correctly as half a degree . He left nothing in writing . Hissuccessors , Anaximander ( 610 - 547 B . c . ) and Anaximenes ( 550 - 475 B . c . )

...

Page 54

Newton found the distance through which she is actually drawn as a fraction of

the earth ' s

use a wrong

for a ...

Newton found the distance through which she is actually drawn as a fraction of

the earth ' s

**diameter**. But when he first examined this matter he proceeded touse a wrong

**diameter**for the earth , and he found a serious discrepancy . This ,for a ...

Page 88

9 inches

century gigantic reflectors have been made . Lassel ' s 2 - foot reflector , made by

himself ...

9 inches

**diameter**and 13 . 5 feet focal length , and another , of 12 inches**diameter**and 18 feet focal length , for Lamont , of Munich . In the nineteenthcentury gigantic reflectors have been made . Lassel ' s 2 - foot reflector , made by

himself ...

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### Contents

Ancient GREEK ASTRONOMY | 3 |

INSTRUMENTS OF PRECISIONSIZE OF THE SOLAR | 10 |

GALILEO AND THE TELESCOPENOTIONS OF GRAVITY | 46 |

5 other sections not shown

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### Common terms and phrases

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