Earlier quoted context omitted.
It's easy if you're deciding between two masses for an electron. In that case you've already decided that some theory which describes electrons is the one for you--so in that context one is a fact that the other is just plain false. But it gets tricky in cases where you're deciding between facts whose enclosing theories are incompatible. Is gravity a force, or is it an acceleration? Each is a fact in its own theory--…
> it gets tricky in cases where you're deciding between facts whose enclosing theories are incompatible. Is gravity a force, or is it an acceleration? This isn't deciding between facts. It's deciding between different theoretical interpretations of the same facts. The facts of gravity didn't change when Einstein discovered General Relativity. All that changed was the theoretical model. > Your epistemology appears to…
You seem to believe that facts are like rocks: You can look at a rock with one pair of glasses, and then you can put a different pair of glasses on and be reasonably assured that you're looking at the same rock. This works because the laws of physics give us a context in which rocks can be individuated. Reality is a convenient authority for this sort of thing.
So far as I can tell, there is no such authority for facts. What wider context is there to appeal to if you want to know whether you're looking at the same fact in a different light, or a new fact? If you know of such a method, I am sincerely interested to know it.
Consider the Michelson Morely experiment. Initially, it established that the velocity of the aether relative to the Earth was 0. Now, we look back on it and say that it established that the speed of light in certain directions does not depend on certain orbital characteristics of the earth. I don't think it's so crazy to imagine a future where a new means of interpreting experiments has taken hold, and from which we would give yet a third description for the experiment established. I think this situation is simpler if these all count as separate facts.
> The facts of gravity didn't change when discovered General Relativity. All that changed was the theoretical model.
Do "the facts of gravity" include the predictions made by the theory of gravity? Because in a number of notable cases they did in fact change when Einstein's theory became the one we use for gravity.
Speaking of Einstein, before he pubished his paper on special relativity, wasn't it a fact that the velocity of a bullet fired from a train (relative to the track) is the sum of the train's velocity and the bullet's velocity? (i.e. the only relevant transformations re: velocity are galilean transformations)? We may not have noticed that this seemingly absolute fact was actually only a fact according to the galilean theory of motion, because no competing theories were available. But once alternatives became available, it was necessary to relativize the fact and add the "according to" part.
Given that we can't know which facts might later need to be relativized, isn't the safer move to assume that all of them are in scope for this kind of change? If we managed to install in everyone a proper respect for scientific authority, would Einstein have had the courage to disregard the fact about how velocities are added?