clean example of spin entity around other entity

gistfile1.txt

if (ent instanceof EntityPlayer) {
  EntityPlayer player = (EntityPlayer) ent;
  List<EntityLivingBase> ents = ent.world.getEntitiesWithinAABB(EntityLivingBase.class, new AxisAlignedBB(ent.getPosition()).grow(10, 10, 10));
  for (Entity entToSpin : ents) {
    //get the vector of x and z
    double vecX = player.posX - entToSpin.posX;
    double vecZ = player.posZ - entToSpin.posZ;
    //atan2 will give you the angle for yaw, for how minecraft works this will be 90 degrees off from an angle that will aim it directly at center entity
    float yawDegrees = (float)(Math.toDegrees(Math.atan2(vecZ, vecX)));
    //make the spin a bit tighter around the center entity, subtracting a full 90 degrees pulls it right towards you
    yawDegrees -= 10;
    float speed = 0.2F;
    entToSpin.motionX += -Math.sin(Math.toRadians(yawDegrees)) * speed;
    entToSpin.motionZ += Math.cos(Math.toRadians(yawDegrees)) * speed;
  }

}