[Vaquero]

can't go back in time.....that would be a pair-of-ducks

[WestVirginiaRebel]

Bonus points to anyone who can tell what Spidere Robinson story that's from : )

Re the whole Earth moving through space thing: In the TV sereis Seven Days they dealt with this by having their hero use an escape pod-like thing to follow the Earth back along its orbit. In Quantum Leap Sam's mind (?) seems to be able to travel through space when he Leaps into another body. Or maybe they will all just use flux capacitors.