## History of Astronomy |

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... this in his calculations by supposing that the centre, about which the sun

moves uniformly, is situated a little distance from the fixed earth. He called this

point the

apses.

... this in his calculations by supposing that the 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 ofapses.

Page

to the “

called the equant, and he supposed that a radius drawn to the sun from the

computed tables ...

to the “

**excentric**” was called the line of apses. A circle having this centre wascalled 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 thencomputed tables ...

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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