## History of Astronomy |

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He measured the equation of time and the irregular motion of the sun; and

allowed for this in his

sun moves uniformly, is situated a little distance from the fixed earth. He called

this ...

He measured the equation of time and the irregular motion of the sun; and

allowed for this in his

**calculations**by supposing that the centre, about which thesun moves uniformly, is situated a little distance from the fixed earth. He called

this ...

Page

Thus Newton, after having established his great principle, devoted his splendid

intellect to the

projected with any velocity in free space, subject only to a central force, varying ...

Thus Newton, after having established his great principle, devoted his splendid

intellect to the

**calculation**of its consequences. He proved that if a body beprojected with any velocity in free space, subject only to a central force, varying ...

Page

He invented the infinitesimal calculus which is more suited for such

but had he expressed his results in that language he would have been

unintelligible to many. Newton's method of

equinoxes, ...

He invented the infinitesimal calculus which is more suited for such

**calculations**,but had he expressed his results in that language he would have been

unintelligible to many. Newton's method of

**calculating**the precession of theequinoxes, ...

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### Common terms and phrases

accurate observations Airy ancient Astronomer Royal astronomical units axis bright calculations Cape Cassini catalogue centre century Chaldĉans Chinese comet compute Copernicus diameter discovered discovery earth eclipse Egyptian epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley Halley’s heavenly bodies heavens heliometer Herschel Hipparchus Huggins hydrogen hypothesis instruments invented John Herschel Jupiter Jupiter’s Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance measured Mercury meteor miles a second moon nebula Newton Observatory parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil recognised records refractor retrograde retrograde motion revolution revolving round ring rotation satellites seems seen showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spot sun’s sun’s surface supposed tables telescope theory Trans Tycho Brahe Tychonic system Uranus velocity Venus Verrier zenith