void display(void)
{
   glClear (GL_COLOR_BUFFER_BIT);
   glClear (GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix();
   glColor3f(1.0, 1.0, 0.0);
 
   if(shapeState == 0)
	   glutSolidSphere(1.0, 20, 16);   /* draw sun */
   else if(shapeState == 1)
	   glutWireSphere(1.0, 20, 16);
 
   glRotatef ((GLfloat) year, 0.0, 1.0, 0.0);
   glTranslatef (2.0, 0.0, 0.0);
   /* draw moon  before rotating for earth exis spin */
   glPushMatrix();

   glRotatef((GLfloat) year, 0.0, 1.0, 0.0);
   glTranslatef(0.5, 0.0, 0.0);
   glRotatef((GLfloat) month, 0.0, 1.0, 0.0);
   //glTranslatef(2.0, 0.0, 0.0);
 
   glColor3f(1.0, 1.0, 1.0);
 
   if(shapeState == 0)
	   glutSolidSphere(0.1, 10, 8); // Draw moon
   else if(shapeState == 1)
	   glutWireSphere(0.1, 10, 8);
   glPopMatrix();

   glRotatef ((GLfloat) day, 0.0, 1.0, 0.0);
 
   glColor3f(0.0, 0.0, 1.0);
 
   if(shapeState == 0)
	   glutSolidSphere(0.2, 10, 8);    /* draw earth */
   else if(shapeState == 1)
	   glutWireSphere(0.2, 10, 8);
 
   glPopMatrix();
   glutSwapBuffers();
}