People complain about the proportional sizing of Mercator but the sense of direction it gives us is completely broken.
With respect, this is silly. People complain about the proportional sizing of the Mercator projection because disproportionate sizing is literally the only problem with the Mercator projection.
The sense of direction being off has got literally nothing to do with Mercator. That’s an inherent drawback of trying to project a three dimensional globe onto a 2D image. Literally every single projection has this exact problem, in one form or another. It is considered ot be an acceptable trade-off for not having to work with globes all the time.
Stop looking for yet more baseless reasons to bash the Mercator projection, which is a perfectly reasonable and acceptable projection to use within its intended usecase (which this specific example literally is).








Literally the entire point of the comment that you’re responding to is that it isn’t true for the metre, and it isn’t true for any SI units.
Your entire claim of tautology rests on the assertion that the speed of light is defined by something external to light itself. That’s false. It remains false irrespective of which SI measurements you swap in.
Just because the speed of light can be expressed in terms of SI units, doesn’t mean its definition depends on them. Which is the point that wolframhydroxide was making.
This directly disproves your original assertion of tautology.