I think quill stem do that to correct the angle of the headtube, so, theorically, is should get closer to zero.
You've completely misunderstood :-/
This is a zero degree stem:
Obviously is far too green but.....
Nah, that's a 90° stem :-)
Sorry, I didn't mean that the newer 0 degree angle stems should be read relative to the ground.
I meant that a normal quill stem was (probably) born at -x degrees (relative to itself) so that it'd be closer to 0 degrees relative to the ground.
@miro_o started
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I think quill stem do that to correct the angle of the headtube, so, theorically, is should get closer to zero.