Page 580 - 89 history of astronomy_opt
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by Bessel and Henderson. Both used stars
whose proper motion had been found to be
large, as this argued proximity. Hender-
ˆ
son, at the Cape of Good Hope, observed I l
Centauri, whose annual proper motion he
found to amount to 3”.6, in 1832-3; and a
few years later deduced its parallax 1”.16.
His successor at the Cape, Maclear, reduced
this to 0”.92.
580
