Note: I am actually also searching for the term in German. That is why I posted this here (as opposed to the language SE's), besides me looking for this term in a mathematical/technical context.
I'd like to say "the points are shifted ______ly as the radius of the circle grows".
With "shifted" I aimed to convey the change of place to be discrete.
Searching I found "radial", "axial" and "circular", of which the first two are probably wrong, while the last one seems to be used predominantly in the sense of "circle-shaped" or "round". However, Merriam-Webster suggests "moving or going around in a circle" as an alternative definition—is this interpretation somewhat usual?
In German, the yield is even less, as can be seen from the Duden entry on "zirkulär".