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Excerpts from netnews.sci.physics: 29-Sep-92 Re: Spin Robert
Firth@sei.cmu.edu (445)

> And I'm still waiting for somebody to cite the passage in the Principia
> where Newton says gravity travels with infinite speed.

I haven't read it, but surely it's directly implied. The formula F = m1
* m1 / d^2 doesn't mention time, but if you had pounded on Newton a
little,  he would have admitted that he's computing the force at time T
from the distance at time T. So, more generally,
 F(t) = m1*m2 / dist(p1(t), p2(t)), where p1(t) and p2(t) are the
positions of the objects at time t. This implies, or assumes [depending
on your definition of "scientific theory" :-) ] that gravity propagates
instantaneously.

--Z

"And Aholibamah bare Jeush, and Jaalam, and Korah: these were the borogoves..."