Date: June 2006
When Newton discovered his law of gravity, how did
he write the formula in 1666 before G was discovered in 1798.
Is F=m1m2/d2 correct, and where (what chapter and/or page) in his
Principia did he actually write it down.
With a G. He did not know the value of G (Cavendish figured this
out), but he knew there must be a constant of proportionality.
Nathan A. Unterman
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Update: June 2012