Forcing a sphere to spin - processing

Question

I am working on an animation of a simplified solar system and want to apply rotation to the Sun. It seems to be a simple task, but somehow it won't work. I try to write my program using object-oriented paradigm, so each planet, moon and the Sun is an object of the CelestialBody class.
I tried to put the rotate(angle) line in an following excerpt from the CelestialBody class, as follows:
if(Type == 4){
emissive(255, 255, 255);
pointLight(255, 255, 255, 0, 0, 0); //for the normal behaviour of the sun light
lightFalloff(0, 0, 0.00020); //light falls off right behind the surface of the sun
ambientLight(255, 255, 255, 0, 0, 0); //ambientLight in the center of the sun
rotate(angle);
}
Sadly, it does nothing. How to fix this and make the sun rotate, for example along the x-axis?
Here's my code:
Main file:
import peasy.*; //<>//
PImage bg;
float angle = 0;
CelestialBody planet1;
CelestialBody planet2;
CelestialBody planet3;
CelestialBody planet4;
CelestialBody planet5;
CelestialBody sun;
PImage sunTexture;
PImage rocketTexture;
PShape rocket;
PeasyCam cam;
void setup() {
fullScreen(P3D);
bg = loadImage("background.jpg");
sunTexture = loadImage("sun.jpg");
cam = new PeasyCam(this, 1200);
rocket = loadShape("rocket.obj");
noStroke();
sun = new CelestialBody(70, 0, 0, 255, 200, 50, 4);//4 - type: sun
sun.planet.setTexture(sunTexture);
//noStroke();
//emissive(0, 0, 0);
planet1 = new CelestialBody(16, 150, 0.01, 150, 50, 255, 1);
planet1.spawnMoon(2);
planet2 = new CelestialBody(25, 300, 0.014, 50, 100, 255, 1);
planet2.spawnMoon(3);
planet3 = new CelestialBody(35, 450, -0.015, 255, 100, 40, 2);
planet3.spawnMoon(1);
planet4 = new CelestialBody(50, 650, 0.011, 50, 200, 255, 1);
planet4.spawnMoon(2);
planet5 = new CelestialBody(65, 900, -0.014, 0, 100, 0, 1);
planet5.planet = rocket;
planet5.planet.scale(0.9);
}
void makeOrbit(int a, int r){
for(int i=0; i<a; i++){
stroke(255, 10);
ellipse(height/2,width/2,r,r);
r-=180;
}
noStroke();
}
void draw() {
background(bg);
//lights();
noFill();
//translate(width/2, height/2);
stroke(#FFFFFF);
//ellipse(0,0,300,300);
//ellipse(0,0,600,600);
//ellipse(0,0,900,900);
//ellipse(0,0,planet4.distance,planet4.distance
// int z = 100;
//for (int i = 0; i<2; i++){
// z = -z;
// pointLight(255, 255, 255, -100, -100, z);
// pointLight(255, 255, 255, 100, -100, z);
// pointLight(255, 255, 255, 100, 100, z);
// pointLight(255, 255, 255, -100, 100, z);
//}
//emissive(255, 255, 255);
//pointLight(255, 255, 255, 0, 0, 0); //for the normal behaviour of the sun light
//lightFalloff(0, 0, 0.00025); //light falls off right behind the surface of the sun
//ambientLight(255, 255, 255, 0, 0, 0); //ambientLight in the center of the sun
sun.show();
planet1.show();
planet1.orbit();
planet2.show();
planet2.orbit();
planet3.show();
planet3.orbit();
planet4.show();
planet4.orbit();
planet5.show();
planet5.orbit();
}
CelestialBody class:
class CelestialBody {
float radius;
float angle = random(TWO_PI);
float distance;
float orbitSpeed;
PShape planet;
CelestialBody[] moons;
int red;
int green;
int blue;
PVector v;
//PShape globe;
int Type;
CelestialBody(float _radius, float _distance, float _orbitSpeed, int _red, int _green, int _blue, int type) {
v = PVector.random3D();
radius = _radius;
distance = _distance;
v.mult(distance);
orbitSpeed = _orbitSpeed;
red = _red;
green = _green;
blue = _blue;
//stroke(red, green, blue);
fill(red, green, blue);
if(type == 1 || type == 4){
planet = createShape(SPHERE, _radius);
}
else if(type == 2){
planet = createShape(BOX, _radius);
}
Type = type;
}
void orbit() {
angle += orbitSpeed;
if (moons != null) {
for (int i = 0; i < moons.length; i++) {
moons[i].orbit();
}
}
}
void spawnMoon(int total){
moons = new CelestialBody[total];
for(int i = 0; i < moons.length; i++){
float r = radius / random(2,5);
float d = random((radius + r), (radius + r)*2);
float o = random(0.01, 0.05);
moons[i] = new CelestialBody(r, d, o, (int)random(0, 256), (int)random(0, 256), (int)random(0, 256), 1);
}
}
void show() {
pushMatrix();
PVector v2 = new PVector(1,0,1);
PVector p = v.cross(v2);
rotate(angle,p.x, p.y, p.z);
translate(v.x, v.y, v.z);
if(Type == 4){
emissive(255, 255, 255);
pointLight(255, 255, 255, 0, 0, 0); //for the normal behaviour of the sun light
lightFalloff(0, 0, 0.00020); //light falls off right behind the surface of the sun
ambientLight(255, 255, 255, 0, 0, 0); //ambientLight in the center of the sun
}
//shape(globe);
shape(planet);
if (moons != null) {
for (int i = 0; i < moons.length; i++) {
moons[i].show();
}
}
noStroke();
popMatrix();
}
}