## History of Astronomy |

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He determined the ratio of the sun's

the

Anaximander (610-547 B.C.) and Anaximenes (550-475 B.C.), held absurd ...

He determined the ratio of the sun's

**diameter**to its orbit, and apparently made outthe

**diameter**correctly as half a degree. He left nothing in writing. His successors,Anaximander (610-547 B.C.) and Anaximenes (550-475 B.C.), held absurd ...

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Aristarchus (320-250 B.C.) showed that the sun must be at least nineteen times

as far off as the moon, which is far short of the mark. He also found the sun's

the ...

Aristarchus (320-250 B.C.) showed that the sun must be at least nineteen times

as far off as the moon, which is far short of the mark. He also found the sun's

**diameter**, correctly, to be half a degree. Eratosthenes (276-196 B.C.) measuredthe ...

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### Common terms and phrases

accurate observations Airy ancient Astronomer Royal astronomical units axis bright calculations Cape Cassini catalogue centre century Chaldĉans Chinese comet compute Copernicus diameter discovered discovery earth eclipse Egyptian epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley Halley’s heavenly bodies heavens heliometer Herschel Hipparchus Huggins hydrogen hypothesis instruments invented John Herschel Jupiter Jupiter’s Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance measured Mercury meteor miles a second moon nebula Newton Observatory parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil recognised records refractor retrograde retrograde motion revolution revolving round ring rotation satellites seems seen showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spot sun’s sun’s surface supposed tables telescope theory Trans Tycho Brahe Tychonic system Uranus velocity Venus Verrier zenith