" The earth revolves about the sun in
the circumference of a circle, the sun lying in the middle of
the orbit, and the sphere of the fixed stars, situated about
the same center as the sun, is so great that the circular
orbit of the earth is as small as a point compared with that
sphere [Aristarchus of Samos c. 270 BCE]."
IAASARS, National Observatory of Athens
I. Metaxa & Vas. Pavlou St., GR-15236, Penteli, Greece