In Shiffman's Learning Processing, he gives an example of a solar system (several planets around a sun) in 2D. I want to transform it into 3D. Certainly this is possible, but how do I handle this following problem?

Let's say I have Earth orbiting the sun. I want Earth to rotate on its own axis (a simple rotate() will do the job) but I also want it to orbit the sun. My Earth will be a sphere: sphere(80), let's say. I'll have translated to the center of the sphere, making my new origin the center of the Earth. 

Because rotate() rotates the object around it's origin, and in this case my origin will be the center of the Earth, how can I manage to have it rotate on its axis and orbit the sun? It seems like I can only have the former.

Thanks!

I'm using a lot of code from the program here:  http://www.openprocessing.org/visuals/?visualID=1912

Here is what I have - my Frogger character is not moving when I use the arrows keys. I am not including my Background/Car/Log class, just my setup/draw and my Frog class.

2. BG gamebg;
3. Car car1, car2, car3, car4, car5, car6, car7, car8, car9, car10;
4. Log log1, log2, log3, log4, log5, log6, log7, log8, log9, log10, log11, log12;
5. Frog Frogger;
6. 
   
7. void setup() {
8.   frameRate(20);
9.   size(700, 700);
10. 
    
11.   gamebg = new BG();
12. 
    
13.   background(32, 139, 18);
14. 
    
15.   car1 = new Car(0, 375, -7);
16.   car2 = new Car(255, 420, 6);
17.   car3 = new Car(200, 465, -7);
18.   car4 = new Car(350, 510, 6);
19.   car5 = new Car(500, 555, -6);
20.   car6 = new Car(350, 375, -7);
21.   car7 = new Car(650, 420, 6);
22.   car8 = new Car(350, 465, -7);
23.   car9 = new Car(125, 510, 6);
24.   car10 = new Car(75, 555, -6);
25. 
    
26.   log1 = new Log(75, 65, -4);
27.   log2 = new Log(475, 65, -4);
28.   log3 = new Log(350, 110, 6);
29.   log4 = new Log(650, 110, 6);
30.   log5 = new Log(350, 155, -4);
31.   log6 = new Log(650, 155, -4);
32.   log7 = new Log(350, 200, 6);
33.   log8 = new Log(500, 200, 6);
34.   log9 = new Log(350, 245, -4);
35.   log10 = new Log(200, 245, -4);
36.   log11 = new Log(0, 290, 6);
37.   log12 = new Log(255, 290, 6);
38. 
    
39.   Frogger = new Frog(350, 620);
40. }
41. 
    
42. void draw() {
43.   gamebg.showBG();
44. 
    
45.   log1.move();
46.   log1.display();
47.   log2.move();
48.   log2.display();
49.   log3.move();
50.   log3.display();
51.   log4.move();
52.   log4.display();
53.   log5.move();
54.   log5.display();
55.   log6.move();
56.   log6.display();
57.   log7.move();
58.   log7.display();
59.   log8.move();
60.   log8.display();
61.   log9.move();
62.   log9.display();
63.   log10.move();
64.   log10.display();
65.   log11.move();
66.   log11.display();
67.   log12.move();
68.   log12.display();
69. 
    
70.   if (log1.ride(Frogger)) {
71.     Frogger.rideleft(); 
72.   }
73.   if (log2.ride(Frogger)) {
74.     Frogger.rideleft(); 
75.   }
76.   if (log5.ride(Frogger)) {
77.     Frogger.rideleft(); 
78.   }
79.   if (log6.ride(Frogger)) {
80.     Frogger.rideleft(); 
81.   }
82.   if (log9.ride(Frogger)) {
83.     Frogger.rideleft(); 
84.   }
85.   if (log10.ride(Frogger)) {
86.     Frogger.rideleft(); 
87.   }
88. 
    
89.   if (log3.ride(Frogger)) {
90.     Frogger.rideright(); 
91.   }
92.   if (log4.ride(Frogger)) {
93.     Frogger.rideright(); 
94.   }
95.   if (log7.ride(Frogger)) {
96.     Frogger.rideright(); 
97.   }
98.   if (log8.ride(Frogger)) {
99.     Frogger.rideright(); 
100.   }
101.   if (log11.ride(Frogger)) {
102.     Frogger.rideright(); 
103.   }
104.   if (log12.ride(Frogger)) {
105.     Frogger.rideright(); 
106.   }
107. 
     
108.   Frogger.show();
109. 
     
110.   if (car1.intersect(Frogger)) {
111.     Frogger.die(); 
112.   }
113.   if (car2.intersect(Frogger)) {
114.     Frogger.die();
115.   }
116.   if (car3.intersect(Frogger)) {
117.     Frogger.die();
118.   }
119.   if (car4.intersect(Frogger)) {
120.     Frogger.die();
121.   }
122.   if (car5.intersect(Frogger)) {
123.     Frogger.die();
124.   }
125.   if (car6.intersect(Frogger)) {
126.     Frogger.die();
127.   }
128.   if (car7.intersect(Frogger)) {
129.     Frogger.die();
130.   }
131.   if (car8.intersect(Frogger)) {
132.     Frogger.die();
133.   }
134.   if (car9.intersect(Frogger)) {
135.     Frogger.die();
136.   }
137.   if (car10.intersect(Frogger)) {
138.     Frogger.die();
139.   }
140. }
141. 
     
142. //Frog class:
143. 
     
145. class Frog {
146.   float x_;
147.   float y_;
148.   float r;
149. 
     
150.   Frog(float tempXpos, float tempYpos) {
151. 
     
152.     x_ = tempXpos;
153.     y_ = tempYpos;
154.   }
155. 
     
156.   void show() {
157.     r = 15;
158.     fill (51, 165, 27);
159.     stroke(0);
160.     strokeWeight(3);
161.     ellipse(x_, y_, r*2, r*2); 
162.     fill(0);
163.     ellipse(x_ + 8, y_ - 15, 8, 8);
164.     ellipse (x_ - 8, y_ - 15, 8, 8);
165. 
     
166.     if (y_ < 50) {
167.       x_ = 350;
168.       y_ = 620;
169.     }
170.   }
171. 
     
172.   void Down() {
173.     y_ = y_ + 45;
174.   }
175.   void Up() {
176.     y_ = y_ - 45;
177.   }
178.   void Left() {
179.     x_ = x_ - 45;
180.   }
181.   void Right() {
182.     x_ = x_ + 45;
183.   }
184. 
     
185.   void die() {
186.     x_ = 350;
187.     y_ = 620; 
188.   }
189. 
     
190.   void rideright() {
191.     x_ = x_ + 16;
192.   }
193. 
     
194.   void rideleft() {
195.     x_ = x_ - 8;
196.   }
197. 
     
198.   void keyPressed() {
199.     if (key == CODED) {
200.       if (keyCode == DOWN) {
201.         Frogger.Down(); 
202.       }
203.       else if (keyCode == UP) {
204.         Frogger.Up(); 
205.       }
206.       else if (keyCode == LEFT) {
207.         Frogger.Left(); 
208.       }
209.       else if (keyCode == RIGHT) {
210.         Frogger.Right(); 
211.       }
212.     }
213.   }
214. }