Please read it: http://www.stellarium.org/doc/0.12.1/classStelMainScriptAPI.html#a0ada201c8c3f235346411886a41f447c
Please read it: http:// www.stellarium. org/doc/ 0.12.1/ classStelMainSc riptAPI. html#a0ada201c8 c3f235346411886 a41f447c