History of Astronomy |
From inside the book
Results 1-5 of 16
Page 3
... Hipparchus , about 150 B. C. , and Ptolemy a little later , were able to use the observations of Chaldĉan astrologers , as well as those of Alexandrian astro- nomers , and to make some discoveries which have helped the progress of ...
... Hipparchus , about 150 B. C. , and Ptolemy a little later , were able to use the observations of Chaldĉan astrologers , as well as those of Alexandrian astro- nomers , and to make some discoveries which have helped the progress of ...
Page 18
... Hipparchus ( 190-120 B.C. ) may be regarded as the founder of observational astronomy . He measured the obliquity of the ecliptic , and agreed with Eratosthenes . He altered the length of the tropical year from 365 days , 6 hours to 365 ...
... Hipparchus ( 190-120 B.C. ) may be regarded as the founder of observational astronomy . He measured the obliquity of the ecliptic , and agreed with Eratosthenes . He altered the length of the tropical year from 365 days , 6 hours to 365 ...
Page 19
... Hipparchus observed a new star . This upset every notion about the permanence of the fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences ...
... Hipparchus observed a new star . This upset every notion about the permanence of the fixed stars . He then set to work to catalogue all the principal stars so as to know if any others appeared or disappeared . Here his experiences ...
Page 20
... Hipparchus was also the inventor of trigonometry , both plane and spherical . He explained the method of using eclipses for determining the longitude . In connection with Hipparchus ' great discovery it may be mentioned that modern ...
... Hipparchus was also the inventor of trigonometry , both plane and spherical . He explained the method of using eclipses for determining the longitude . In connection with Hipparchus ' great discovery it may be mentioned that modern ...
Page 22
George Forbes. of the universe . He adopted the excentric and equant of Hipparchus to explain the unequal motions of the sun and moon . He adopted the epicycles and deferents which had been used by Apollonius and others to explain the ...
George Forbes. of the universe . He adopted the excentric and equant of Hipparchus to explain the unequal motions of the sun and moon . He adopted the epicycles and deferents which had been used by Apollonius and others to explain the ...
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