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What Is GTT and GRR?
The only components of the metric that matter are GTT and GRR. GTT is 1 minus 2GM over R, where M is the mass of the object and R is the distance. When you're very far away from the sun in the Schwarzschild metric, the personal time that you measure on your watch is one times the time coordinate. In other words, almost no time passing compared to the people who stayed out near the sun.