Page 374 - 89 history of astronomy_opt

observations have been a model and a stan-
dard for the whole world.
Airy also undertook to superintend the
reduction of all Greenwich lunar observa-
tions from 1750 to 1830. The value of this
laborious work, which was completed in 1848,
cannot be over-estimated.
The demands of astronomy, especially
in regard to small minor planets, required
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