size(250,250);
  smooth();
  background (0);

for (int c=10; c<1500; c+=25) {
  fill(000000,0);
  stroke(#D74700,c*250);
  ellipse(82,48,c,c);
}

for (int c=45; c<520; c+=50) {
  noFill();
  stroke(#A84700,c/2);
  ellipse(80,50,c,c);
}

  for (int c=-0; c<520; c+=20) {
fill(000000,0);
stroke(#31A9BB,c*5);
  ellipse(80,50,c,c);
}

for (int c=90; c<500; c+=10) {
  fill(000000,0);
  stroke(#073A3B,c*123);
  ellipse(80,50,c,c);
}