Page 561 - 89 history of astronomy_opt
P. 561
13th, A.D. 902. The orbital motion of a
cloud or stream of small particles was indi-
cated. The period favoured by H. A. New-
ˆ
ton was 354A days; another suggestion was
ˆ
ˆ
375A days, and another 33A years. He no-
ticed that the advance of the date of the
shower between 902 and 1833, at the rate of
one day in seventy years, meant a progres-
sion of the node of the orbit. Adams under-
561
