|v = sqrt(GM/r)
IMO the most important way to understand the physical reality is by performing experiments, observations and measurements.
Regarding the evolution of these processes time is an important issue. Time in the sense that it takes time for different individual processes, which are taking place at different locations to influence each other. This influences can be in the form of material transport or as radiation. Gravity in that sense can also be considered radiation. Light as such is also radiation.
In order to mathematical describe the evolution of a process it is important to describe positions of the subprocesses as accurate as possible. In order to do that you need one coordinate system and set of fixed ideal clocks, linked to a grid. The problem is that each clock is also a process, and to take care that they all tick at the same rate, they should not move. This is very important if you want to calculate the speed of an object as used in equation 1 and 2. There is more to say about this subject, but I will leave that for later
|M = r*v^2/G
The conclusion is that certain parameters can be calculated based on mathematics, assumptions and observations, but that is no quarantee that these same parameters and can be used to predict the future.
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