Page 660 - 89 history of astronomy_opt

[1] R. S. Phil Trans ., 1810 and 1817-
24.
[2] One of the most valuable contribu-
tions to our knowledge of stellar parallaxes
is the result of Gill’s work ( Cape Results ,
vol. iii., part ii., 1900.)
[3] Taking the velocity of light at 186,000
miles a second, and the earth’s mean dis-
tance at 93,000,000 miles, 1 light year=5,865,696,000,000
660