Page 503 - 89 history of astronomy_opt

hours, by observing a bright spot on her
˜
surface. ShrAter made it 23h. 21m. 19s.
This value was supported by others. In
1890 Schiaparelli[2] announced that Venus
rotates, like our moon, once in one of her
revolutions, and always directs the same face
to the sun. This property has also been
ascribed to Mercury; but in neither case
has the evidence been generally accepted.
503