Page 583 - 89 history of astronomy_opt

units a year; 61 Cygni 37.9 miles a sec-
ond=11.2 astronomical units a year. These
successes led to renewed zeal, and now the
distances of many stars are known more or
less accurately.
Several of the brightest stars, which might
be expected to be the nearest, have not
shown a parallax amounting to a twentieth
of a second of arc. Among these are Cano-
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