To test his gravitational theory, Newton calculated the period of the moon around the Earth to see if he got the observed 27.3 days. Section 7.6 derived T = 2π . How could Newton calculate T when he didn't know the value of G or of M?

Question

To test his gravitational theory, Newton calculated the period of the moon around the Earth to see if he got the observed 27.3 days. Section 7.6 derived T = 2π  . How could Newton calculate T when he didn't know the value of G or of M?

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The Answer of To test his gravitational theory, Newton calculated the period of the moon around the Earth to see if he got the observed 27.3 days. Section 7.6 derived T = 2π  . How could Newton calculate T when he didn't know the value of G or of M?

To Test His Gravitational Theory, Newton Calculated the Period of the Moon