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curate delineations of shape, but actually
for the discovery of most of them. The art
has also been applied to the observation of
comets at distances from their perihelia so
great as to prevent their visual observation.
Thus has Wolf, of Heidelburg, found upon
old plates the position of comet 1905.v., as
a star of the 15.5 magnitude, 783 days be-
fore the date of its discovery. From the
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