Hello to everyone! I am trying to understand in practice the Gravitational Time Dilation by calculating the time distortion near the supermassive black hole Sgr A* in our Galactic Center. According to Einstein's Theory of General Relativity, the time distortion near a black hole is calculated with the following formula: T^2 = t^2 / 1 - ( Rs / r ), where: T= Observer A time, far away from the black hole t = Observer B close to the black hole r = Distance between the black hole and Observer B Rs= Schwarzschild Radius For the Sgr A* black hole I found that the Schwarzschild Radius is Rs=13 * 10^16 km. Based on that, I tried to calculate how close to the Event Horizon of the black hole does Observer B have to be so that Observer A sees 60 seconds pass for every 12 seconds on Observer B clock. I calculated that the distance should be r=541.666,67 km Could you tell me please if my reasoning is correct and if not what is the proper answer? Thank you in advance!