Peter Borst wrote:
> the astronomer Ptolemy. In Ptolemy's planetary model, the earth was at
> the center, the planets and the sun made circular orbits around the
> earth

Interestingly enough, even today if you look at an astronomical 
ephemeris you'll find orbital elements for the Sun and planets, but not 
for the Earth. This just serves to show that even incorrect models can 
have their uses.

George-
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George Fergusson
Whitefield Maine

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