Page 661 - 89 history of astronomy_opt

miles or 63,072 astronomical units; 1 astro-
nomical unit a year=2.94 miles a second;
and the earth’s orbital velocity=18.5 miles
a second.
[4] Ast. Nacht., 1889.
[5] R. S. Phil. Trans., 1718.
[6] Mem. Acad. des Sciences, 1738, p.
337.
[7] R. S Phil. Trans., 1868.
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