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Can math.atan2 return INF?

On Sun, Jun 26, 2016, at 22:59, Steven D'Aprano wrote:
> We have no way of seeing what goes on past the black hole's event
> horizon, since light cannot escape. But we can still see *some*
> properties of black holes, even through their event horizon: their
> mass, any electric charge they may hold, their angular momentum.

All objects, not just black holes, have those properties. The point here
is that we are in fact observing those properties of an object that is
not yet (and never will be) a black hole in our frame of reference.