We (that's me and the Holy spirit) were asked: if Newton's law of universal gravitation is an empirical formula, how is the accepted mass of the sun (1.9^E30 kg) not empirical?
When Empirical Isn’t
Newton’s Switcheroo
How massive is the sun based if it's orbiting the Earth (of known mass) at a known distance and orbital period? It's equally valid to calculate the mass of the sun in a Geocentrospheric paradigm.