Hello,
I'm trying to calculate Moon revolution period but always got 27.53 instead of 27.32.
G = 6.674e-11 (m^3 kg^-1 s^-2)
M = 5.9724e24 (kg) from http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
R = 384400000 (m) Earth Moon distance
From 4π^2 * R^3 = GM*T^2,
got moon revolution...