A Short History of Astronomy

acceleration accuracy afterwards Almagest angle appears Aristotle astronomical attraction axis Bradley Bradley's bright calculation catalogue celestial bodies celestial sphere centre century chapter circle comet consequently Coppernicus deduced direction discovery distance double star earth eccentricity eclipse epicycle equant equator error estimate explained fact fixed stars Galilei gravitation Greek hence Herschel Hipparchus idea important inequalities instruments irregularities Jupiter Jupiter's Kepler known Lagrange Laplace less light lunar theory Mars mathematical mathematician measured Mercury method minor planets modern moon moon's moving nearly nebulae Newton nutation observations Observatory obtained orbit parallax path period pole position precession Principia probably problem Ptolemy Ptolemy's published recognised regarded Regiomontanus result revolution revolving round rotation round the sun satellites Saturn scientific seen shewed shewn sidereal sidereal period solar system spectrum spherical sun and moon sun's superior planet tables telescope tion transit of Venus treatise Tycho Tycho Brahe Venus