History of Astronomy |
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... round the poleofthe ecliptic,and for this reason the eclipses in one cycleare repeated with very slightmodification in the next cycle,and so on for many centuries. It maybethat theneglect of their dutiesby Hi andHo, and their punishment ...
... round the poleofthe ecliptic,and for this reason the eclipses in one cycleare repeated with very slightmodification in the next cycle,and so on for many centuries. It maybethat theneglect of their dutiesby Hi andHo, and their punishment ...
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... round the sun,which itself revolves round an imaginary central fire calledthe Antichthon. Copernicus in the sixteenth centuryclaimed Pythagorasas thefounder of the systemwhich he, Copernicus, revived. Anaxagoras (born499 B.C.) studied ...
... round the sun,which itself revolves round an imaginary central fire calledthe Antichthon. Copernicus in the sixteenth centuryclaimed Pythagorasas thefounder of the systemwhich he, Copernicus, revived. Anaxagoras (born499 B.C.) studied ...
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... round by a string. Democritus further supposed thatthe inclinationof the flatearth to the ecliptic was due tothe greater weight ofthe southern partsowing to the exuberant vegetation. For furtherreferences to similarefforts of ...
... round by a string. Democritus further supposed thatthe inclinationof the flatearth to the ecliptic was due tothe greater weight ofthe southern partsowing to the exuberant vegetation. For furtherreferences to similarefforts of ...
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... round it onceayear, and the planets eachin its own period,itis only necessaryto impose upon eachofthese an ... round the earth ontheprimary circle (the deferent), atauniform rate round the excentric. Ptolemy supposed the centres of the ...
... round it onceayear, and the planets eachin its own period,itis only necessaryto impose upon eachofthese an ... round the earth ontheprimary circle (the deferent), atauniform rate round the excentric. Ptolemy supposed the centres of the ...
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... round theearth intheir own periodic times, andin their epicycles oncein a year. It did not occur to Ptolemy toplace the centresofthe epicycles of Mercury and Venus at the sun, and toextend the same system to the major planets. Something ...
... round theearth intheir own periodic times, andin their epicycles oncein a year. It did not occur to Ptolemy toplace the centresofthe epicycles of Mercury and Venus at the sun, and toextend the same system to the major planets. Something ...
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Common terms and phrases
Airy allthe andthat andthe asthe Astronomer Royal Astronomia Nova astronomical units atmosphere atthe attraction axis bright bythe calculations catalogue centre century Chaldæans Chinese comet confirmed Copernicus detected diameter discovered discovery distance earth eclipse epicycles equatoreal excentric explain fixed stars FOOTNOTES Frauenhofer fromthe Galileo Greenwich Halley havebeen heavenly bodies heavens heliometer Herschel Hipparchus Huggins hydrogen hypotheses inequality instruments inthe isthe John Herschel Jupiter Jupiter's Kepler lawof Lick Observatory light lines lunar Mars mathematical mean motion measured Mercury meteor miles moon moon's nebula Newton ofthese onthe orbit parallax perihelion period photographic physical planet planetary position predicted proper motion Ptolemy records reflector refractor retrograde retrograde motion revolve rotation round satellites Saturn seems solar system spectra spectroscope spectrum spots stellar sun's sunÂspot supposed surface telescope terrestrial thatthe theearth themoon theory thesame thesolar thesun tobe tothe Tycho Brahe Uranus velocity Venus Verrier William Herschel withthe zenith