## History of Astronomy |

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Page 57

Modern Tables .

motion of nodes . . . 19 . 18 . 1 , 23 . . .

Annual equation . . . . . . . . . 11 . 51 . . . Inequality of

43 .

Modern Tables .

**Mean**monthly motion of Apses . . . 1 . 31 . 28 . . .**Mean**annualmotion of nodes . . . 19 . 18 . 1 , 23 . . .

**Mean**value of “ variation ” . . . . . . 36 . 10Annual equation . . . . . . . . . 11 . 51 . . . Inequality of

**mean**motion of apogee 19 .43 .

Page 60

But for his friendly insistence it is possible that the Principia would never have

been written ; and but for his generosity in supplying the

could not have published the book . Sir Isaac Newton died in 1727 , at the age of

...

But for his friendly insistence it is possible that the Principia would never have

been written ; and but for his generosity in supplying the

**means**the Royal Societycould not have published the book . Sir Isaac Newton died in 1727 , at the age of

...

Page 128

This is the nearest known fixed star ; and its light takes 47 / 3 years to reach us .

The lightvear is taken as the unit of measurement in the starry heavens , as the

earth ' s

proper ...

This is the nearest known fixed star ; and its light takes 47 / 3 years to reach us .

The lightvear is taken as the unit of measurement in the starry heavens , as the

earth ' s

**mean**distance is “ the astronomical unit ” for the solar system . Theproper ...

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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