float angle;

void setup() {
  size(300,300);
  ellipseMode(CENTER_DIAMETER);
  framerate(10);
}

void loop() {
  background(200);  

  fill(255);
  ellipseOnCircle(width/2,height/2, 100, angle, 10);
  ellipseOnCircle(width/2,height/2, 100, angle*2, 15);

  for(int i=0; i<5; i++)
    ellipseOnCircle(width/2,height/2, 80, angle*(1+i*0.5), 15);
    
  angle++;
  
  noFill();
  ellipse(width/2,height/2, 200,200);
}

// cx, cy == center
void ellipseOnCircle(float cx,float cy, float radius,float angle, float rad2) {
  float x,y;
    
  x=cos(radians(angle))*radius+ cx;
  y=sin(radians(angle))*radius+ cy;
  ellipse(x,y, rad2,rad2);  
}