Meh. You can have two systems of coordinates related to each other by r_1 = R_Earth^2/r_2, theta_1 = theta_2, phi_1 = phi_2, t_1 = t_2 and as per general relativity both will give you the same answers if you use them right. (But one of the two will be much much easier to use right than the other.)
Meh. You can have two systems of coordinates related to each other by r_1 = R_Earth^2/r_2, theta_1 = theta_2, phi_1 = phi_2, t_1 = t_2 and as per general relativity both will give you the same answers if you use them right. (But one of the two will be much much easier to use right than the other.)