Blender animation without adding keys (using expressions)
Fast render to show you one way using expressions in Blender for creating clocks without animation. For that we use expression in X and Y locations. Exp X location = sin(pi*2*ceil(frame/30)/60)*10 Where "frame/30" the number of frames through which arrow will move.
60 is the number of passes of the arrows along the rim (60 seconds)
"*10" = radius of the cyrcle.
Exp Y location = cos(pi*2*ceil(frame/30)/60)*10
And thats all!
P.S. For move arrows in 3d space need to add "+n" (n= value of move)in the end.