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partly due to a proper motion; but, so far
as it went, this was a beautiful confirmation
of Wilson’s discovery. Hewlett, however,
in 1894, after thirty years of work, showed
that the spots are not always depressions,
being very subject to disturbance.
The Kew photographs [7] contributed
a vast amount of information about sun-
˜
spots, and they showed that the faculA gen-
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