You wouldn't appear upside down in  Australia. The "right way up" will be relative to the earth's core, so you'll teleport relative to the core because physics mate. You should know that if you know so much. DUH,(reply>), If you would instantaneously move from one side of the world to the opposite side without rotating your body, you would be upside down. Since your head would still point in the same direction, but - as you said- you would fall in the opposite direction. He did account for thath.