Uses Graph,CRT;
Var
 d,r,r1,r2,rr,k,
 x1,y1,x2,y2,x01,y01: Integer;
 Xasp, Yasp: Word;
begin
  d := detect;
  InitGraph(d,r,'');
  x1 := GetMaxX div 2;
  y1 := GetMaxY div 2;
  GetAspectRatio(Xasp,Yasp);
  r:= round(3*GetMaxY*Yasp/8/Xasp);
  r1:= round(0.9*r);
  r2:= round(0.95*r);
  Circle(x1,y1,r);
  Circle(x1,y1,round(1.02*r));
  for k := 0 to 59 do
  begin
    if k mod 5 = 0 then
      rr:=r1
    else
      rr:=r2;
    x01:= x1 + round(rr*sin(2*pi*k/60));
    y01:= y1 - round(rr*Xasp*cos(2*pi*k/60)/Yasp);
    x2:= x1 + round(r*sin(2*pi*k/60));
    y2:= y1 - round(r*Xasp*cos(2*pi*k/60)/Yasp);
    Line(x01,y01,x2,y2);
  end;
  SetWriteMode(XorPut);
  SetLineStyle(SolidLn,0,ThickWidth);
  r:=0;
  repeat
    for k := 0 to 59 do
    if not keypressed then begin
      x2:= x1 + round(0.85*r1*sin(2*pi*r/60/12));
      y2:= y1 - round(0.85*r1*Xasp*cos(2*pi*r/60/12)/Yasp);
      x01:= x1 + round(r2*sin(2*pi*k/60));
      y01:= y1 - round(r2*Xasp*cos(2*pi*k/60)/Yasp);
      Line(X1,y1,x2,y2);
      Line(x1,y1,x01,y01);
      Delay(100);
      Line(x1,y1,x01,y01);
      Line(X1,y1,x2,y2);
      inc(r);
      if r=12*60 then r:=0;
    end
  Until keypressed;
  if readkey=#0 then k := ord(readkey);
  CloseGraph;
End.