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An intuitive explanation
The title should have been "Why is the speed of light the same in all frames of references" and not "in all directions" but there doesn't seem to be a way to change that now
A topic I've seen before, but one of the simplest presentations I've ever seen of it. Really well done.
Because everybody knows that the Ether doesn't move. So Ethereal waves travel at the same speed in all directions.