plot a circle at seperate points

Questions
1

Hello Everyone,
I am trying to plot a circle, I wrote a code like this:

x1[\[Psi]_] := Cos[\[Psi]]
y1[\[Psi]_] := Sin[\[Psi]]

When I want to plot a circle, I am using parametric plot

ParametricPlot[{x1[\[Psi]], y1[\[Psi]]}, {\[Psi], 0, 2 Pi}]

However I don’t want all points, This circle must be drawn at only 24 points, for example:

0, 2 Pi/24, 2*2 Pi/24, 3*2 Pi/24...

Maybe I must write a loop but I don’t know. Could you please help me. Thanks a lot.

2 
x1[\[Psi]_] := Cos[\[Psi]];
y1[\[Psi]_] := Sin[\[Psi]];
Show[Graphics[Table[Point[{x1[\[Psi]], y1[\[Psi]]}], {\[Psi], 0, 2 Pi - 2 Pi/24, 2 Pi/24}]]]
3 
x1[\[Psi]_] := Cos[\[Psi]];
y1[\[Psi]_] := Sin[\[Psi]];
ListPlot[Table[{x1[\[Psi]], y1[\[Psi]]}, {\[Psi], 0, 2 Pi - 2 Pi/24, 
   2 Pi/24}]]
4

Bill and Frank, thanks a lot