I was interested in whether it would be possible to move the Earth away from the Sun by using two ion drives on the Moon. One Ion drive on the far side of the Moon would operate briefly while the Moon was exactly between the Sun and the Earth. The other ion drive on the side facing the Earth would operate briefly when the Earth was exactly between the Sun and the Moon . The net effect would be to move the Earth further away from the Sun, provided the ions from the second drive were not captured by the Earth's gravitational field. I calculate it would take 17,000 tons (probably potassium or sodium mined on the Moon) moving at the speed of light (without relativistic mass increase) to get the earth moving one mile and hour in the opposite direction.