Page 137 - 89 history of astronomy_opt

norance of the laws of rotating bodies. To
use the words of Delambre,[7] in drawing
attention to the strange conception,
he imagined that the earth, revolving
round the sun, ought always to show to it
the same face; the contrary phenomena sur-
prised him: to explain them he invented
a third motion, and added it to the two
real motions (rotation and orbital revolu-
137