History of Astronomy |
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Page 16
... centre of the world . Nicetas , Heraclides , and Ecphantes supposed the earth to revolve on its axis , but to have no orbital motion . The short epitome so far given illustrates the extraordinary deductive methods adopted by the ancient ...
... centre of the world . Nicetas , Heraclides , and Ecphantes supposed the earth to revolve on its axis , but to have no orbital motion . The short epitome so far given illustrates the extraordinary deductive methods adopted by the ancient ...
Page 18
... centre , about which the sun moves uniformly , is situated a little distance from the fixed earth . He called this point the excentric . The line from the earth to the " excentric " was called the line of apses . A circle having this centre ...
... centre , about which the sun moves uniformly , is situated a little distance from the fixed earth . He called this point the excentric . The line from the earth to the " excentric " was called the line of apses . A circle having this centre ...
Page 21
... centre : Πληιάδας τ ' ἐσορῶντε καὶ ὀψὲ δύοντα βοώτην " Αρκτον θ ' , ἣν καὶ ἅμαξαν ἐπίκλησιν καλέουσιν , " Η τ ̓ αὐτοῦ στρέφεται καὶ τ ̓ Ωρίωνα δοκεύει , Οἴη δ ̓ ἄμμορος ἐστι λοετρῶν Ωκεανοῖο . " The Pleiades and Boötes that setteth late ...
... centre : Πληιάδας τ ' ἐσορῶντε καὶ ὀψὲ δύοντα βοώτην " Αρκτον θ ' , ἣν καὶ ἅμαξαν ἐπίκλησιν καλέουσιν , " Η τ ̓ αὐτοῦ στρέφεται καὶ τ ̓ Ωρίωνα δοκεύει , Οἴη δ ̓ ἄμμορος ἐστι λοετρῶν Ωκεανοῖο . " The Pleiades and Boötes that setteth late ...
Page 22
... 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 through the sun , and to be ...
... 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 through the sun , and to be ...
Page 23
George Forbes. It did not occur to Ptolemy to place the centres of the epicycles of Mercury and Venus at the sun , and ... centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid ...
George Forbes. It did not occur to Ptolemy to place the centres of the epicycles of Mercury and Venus at the sun , and ... centre of the deferent , and the position of the For definition see p . 22 . 3 For definition see p . 18 . 2 Ibid ...
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Common terms and phrases
accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith