History of Astronomy |
From inside the book
Results 1-5 of 14
Page 9
... circle into 365 degrees . To learn the length of the year needed only patient observation - a characteristic of the Chinese ; but many younger nations got into a terrible mess with their calendar from ignorance of the year's length . I ...
... circle into 365 degrees . To learn the length of the year needed only patient observation - a characteristic of the Chinese ; but many younger nations got into a terrible mess with their calendar from ignorance of the year's length . I ...
Page 18
... circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the excentric passes over equal arcs on the equant in equal times . He then computed tables for predicting the place of the sun . 66 ...
... circle having this centre was called the equant , and he supposed that a radius drawn to the sun from the excentric passes over equal arcs on the equant in equal times . He then computed tables for predicting the place of the sun . 66 ...
Page 22
... circle ( the epicycle ) , whose centre revolves round the earth on the primary circle ( the deferent ) , at a uniform rate round the excentric . Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a bar passing ...
... circle ( the epicycle ) , whose centre revolves round the earth on the primary circle ( the deferent ) , at a uniform rate round the excentric . Ptolemy supposed the centres of the epicycles of Mercury and Venus to be on a bar passing ...
Page 30
... , the impression is made that the jointed bars there spoken of for describing the circles were supposed to be real . This is no more the case than that the spheres of Eudoxus and Callippus were supposed 30 THE GEOMETRICAL PERIOD.
... , the impression is made that the jointed bars there spoken of for describing the circles were supposed to be real . This is no more the case than that the spheres of Eudoxus and Callippus were supposed 30 THE GEOMETRICAL PERIOD.
Page 56
... circle , ellipse , parabola , or hyperbola ; and he found that those comets of which he had observations move in parabolæ round the Sun , and are thus subject to the universal law . Newton realised that , while planets and satellites ...
... circle , ellipse , parabola , or hyperbola ; and he found that those comets of which he had observations move in parabolæ round the Sun , and are thus subject to the universal law . Newton realised that , while planets and satellites ...
Other editions - View all
Common terms and phrases
accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS