## History of AstronomyUnlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy. |

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By this system the tedious arithmetical operations necessary in astronomical

were so much simplified that Laplace declared that by this invention the lifework

of ...

By this system the tedious arithmetical operations necessary in astronomical

**calculations**, especially those dealing with the trigonometrical functions of angles,were so much simplified that Laplace declared that by this invention the lifework

of ...

Page

He actually

precession of the equinoxes discovered by Hipparchus about 150 B.C. One of his

grandest discoveries was a method of weighing the heavenly bodies by their

action on ...

He actually

**calculated**the amount; and so he explained the cause of theprecession of the equinoxes discovered by Hipparchus about 150 B.C. One of his

grandest discoveries was a method of weighing the heavenly bodies by their

action on ...

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