Planet p1, p2, p3, p4, p5;
void setup(){
  size(400, 400, P3D);
  p1 = new Planet(0, 2, #DD33CC);
  p2 = new Planet(45, 3, #EE9922);
  p3 = new Planet(135, 5, #3399FF);
  p4 = new Planet(225, 6, #55EE33);
  p5 = new Planet(300, 2, #99FFEE);
}

void draw(){
  background(0);
  translate(width/2, height/2);
  rotateX(radians(55));
  p1.orbit(50, 55, 2.4, true);
  p2.orbit(120, 132, 1.2, true);
  p3.orbit(60, 66, 1.7, true);
  p4.orbit(150, 165, 2.75, true);
  p5.orbit(20, 22, 1.75, true);
}

class Planet{
  float planetOffset;
  float planetRadius;
  color surface;
  float angle;
  boolean isPathVisible;

  Planet(float planetOffset, float planetRadius, color	surface){
    angle = planetOffset;
    this.planetRadius = planetRadius;
    this.surface = surface;
  }

  void orbit(float ellipticalRadiusX, float ellipticalRadiusY, 
		 float orbitSpeed, boolean isPathVisible){
    // draw ellipse first, so it's under the planet
    if (isPathVisible){
	drawOrbit(ellipticalRadiusX, ellipticalRadiusY);
    }

    float px = cos(radians(angle))*ellipticalRadiusX;
    float py = sin(radians(angle))*ellipticalRadiusY;
    fill(surface);
    noStroke();
    ellipse(px, py, planetRadius*2, planetRadius*2);
    angle+=orbitSpeed;
  }

  void drawOrbit(float ellipticalRadiusX, float ellipticalRadiusY){
    stroke(255, 50);
    float angle=0;
    for (int i=0; i<360; i++){
	point(cos(radians(angle))*ellipticalRadiusX, 
		sin(radians(angle++))*ellipticalRadiusY);
    }
  }
}
 

float angle;
//setup stuff missed, add whatever you need...

void draw()
{
  angle+=0.01;

  float xpos=(width/2.0)*sin(angle);
  float ypos=(height/8.0)*cos(angle);

  //draw sun at width/2,height/2

  //draw planet at xpos,ypos
}