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ing upon the planet.” In a few years the
errors even of these tables became intolera-
ble. In 1835 the error of longitude was 30”;
in 1838, 50”; in 1841, 70”; and, by com-
paring the errors derived from observations
made before and after opposition, a serious
error of the distance (radius vector) became
apparent.
In 1843 John Couch Adams came out
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