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bourhood of spots, and most distinctly near
the sun’s edge, were discovered by Galileo.
A high telescopic power resolves their struc-
ture into an appearance like willow-leaves,
or rice-grains, fairly uniform in size, and
more marked than on other parts of the
sun’s surface.
Speculations as to the cause of sun-spots
have never ceased from Galileo’s time to
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