I think our beloved, Mr. Jacques miscalculated slightly, if he was going for the Back To The Future reference.
The number of seconds Raven quotes is 1.11994212963 days, not 1.21.
Also, one of the really buggery problems in time travel, that no fiction has yet to really deal with, is the fact that the Earth is moving through space.
The spot the espressosourus left will be 6,350 miles further along its orbit around the sun and 43.179 degrees out-of-phase because of the Earth's rotation.
The puts it in orbit over Chicago when it returns.
As you can tell, I'm not much of a Raven fan.