Page 591 - 89 history of astronomy_opt

Hercules, a maximum rate of recession for
stars in the opposite part of the heavens,
and no effect for stars half-way between.
In this way the spectroscope has confirmed
generally Herschel’s view of the direction,
and makes the velocity eleven miles a sec-
ond, or nearly four astronomical units a
year.
The average proper motion of a first mag-
591