The maxim of the age: it's all relative, innit. Poor Albert Einstein, I wonder if he knew what he was letting out of the bag. Of course, before my intelligent readers inundate me with emails pointing out that the theory of relativity has nothing to do with philosophical and moral relativism, I do understand that.
But of course, ideas have consequences. Arthur Lovejoy in his wonderful book 'The Great Chain of Being' traces the effects of the constellation of notions that formed the Great Chain of Being, from Plato through to the nineteenth century. One of the most interesting aspects of the book is how he shows the way philosophical ideas filter through into the popular consciousness, via novels, poetry, even songs, often being distorted along the way.
Thus when Einstein developed his theory, the name he chose tended to validate quite separate ideas and tendencies in philosophy and morality. Perhaps even Albert was affected at some level by these ideas, since in some ways a better name for his work would be the Theory of Invariance.
In the late nineteenth and early twentieth century physicists were wrestling with the problem of frames of reference. That is, in order to measure the motion of an object moving at a constant velocity, you need a reference point that is still. We've probably all experienced that ourselves when sitting in a train at a station and then the train on the next platform starts moving. Or is it our own train? It's a strange, disorientating feeling, is it not? The problem is that motion at a constant speed leaves no imprint on our senses. And even with instruments you need something still against which to calibrate them.
Now this was not a problem when we thought the heavens revolved in splendour around the motionless earth, but by the late nineteenth century it was clear that all the planets and stars were in constant motion. So where could astronomers and physicists find that still point against which to measure the motion of everything else?
The candidate at the time was the ether, the substance that was believed to permeate the universe, and the medium through which light waves travelled, rather like the sea is the medium through which ocean waves travel. But then the famous Michelson-Morley experiment proved that there was no ether through which light could travel.
Ah. Then how can we measure anything at all? A young physicist played some thought experiments, imagining himself riding on a beam of light, and he realised that there was a constant, but it wasn't still, it was moving: the speed of light. It remains the same, whether you are running towards the source of the light or running away from it, or even if the light source is rushing towards you very fast and you would expect the light to get a boost from the speed of its source. Not a bit of it. Light (in a vacuum) always travels at the same speed, 186,000 miles per second.
So rather than describing how the motion of objects can be measured relative to the speed of light, Einstein could have highlighted the invariance of light with respect to everything else.
And perhaps, without the reflected prestige of his extraordinary work, other tendencies within Western thought would not have gained such traction.
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