If the earth moves round the
sun, there should be parallax, i.e. a difference between the relative positions
of neighbouring stars as observed at different times of year. None is
observable with the naked eye. The reason for this, as Copernicus had guessed,
is that the solar system is a relatively tiny place enormously far from even
the nearest stars. Parallax is therefore very small. It was not observed until
1832.
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