Season the goose inside and out with salt and black pepper.
Stuff the cavity with the orange quarters, onion, and thyme.
Place the goose on a rack in a roasting pan, breast side up.
Roast the goose in the preheated oven, basting occasionally with its drippings, for about 3 hours or until the internal temperature of the thigh reaches 180°F (82°C).
Remove the goose from the oven and let it rest for 15 minutes before carving.