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cho discovered in Cassiopeia a new star of
great brilliance, and continued to observe
it until the end of January, 1573. So in-
credible to him was such an event that he
refused to believe his own eyes until he got
others to confirm what he saw. He made
accurate observations of its distance from
the nine principal stars in Casseiopeia, and
proved that it had no measurable parallax.
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