Page 459 - 89 history of astronomy_opt

supreme accuracy. In 1853 he combined
pairs of photographs of the moon in the
same phase, but under different conditions
regarding libration, showing the moon from
slightly different points of view. These in
the stereoscope exhibited all the relief re-
sulting from binocular vision, and looked
like a solid globe. In 1860 he used succes-
sive photographs of the total solar eclipse
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