Sir Isaac Newton came up with the universal law of gravitation and published it in his book, Philosophiæ Naturalis Principia Mathematica (the Principia), in 1687.

In that formula, did Newton know the numerical value of the constant G?

Question 3 options:

1. No, Newton would never know the value of G in his lifetime.


2. Not when he first published it, but later he was able to find a rough value for G experimentally.

3. Yes, before publication he was able to find a rough value for G experimentally.