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fourteen years apart, the two positions of
his camera being at the two ends of a base-
line over 5,000,000,000 miles apart, or fifty-
six astronomical units. On examining these
stereoscopically, some of the stars rise out
of the general plane of the stars, and seem
to be much nearer. Many of the stars are
thus seen to be suspended in space at differ-
ent distances corresponding exactly to their
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