Page 505 - 89 history of astronomy_opt

have not been accounted for by known plan-
ets; and Le Verrier[3] has stated that an
intra-Mercurial planet or ring of asteroids
would account for the unexplained part of
the motion of the line of apses of Mercury’s
orbit amounting to 38” per century.
Mars .–The first study of the appear-
ance of Mars by Miraldi led him to believe
that there were changes proceeding in the
505