Assuming it just spins at the same rate, the other way. Axial tilt is the same, year length is the same.
Perhaps winds and ocean currents? What would the effect be on geography? Would deserts or rainforests be in different places?
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With weather patterns moving in the opposite direction, it's hard to predict what would happen. Weather is a chaotic system, after all.
For example, consider the El Niño effect. Normally, the trade winds blowing across the Pacific keep warm water bunched up to the wast, around Asia and Indonesia. With the trade winds reversed, that water would instead generally be pooled against the Americas, with unpredictable long-term effects.
The Gulf Stream is also driven in part by the trade winds in the Atlantic; with those winds reversed, again, it's hard to guess the consequences. Europe would likely be a frozen wasteland, while Canada and Greenland could become as warm as Europe - or perhaps not, especially when the permanent El Niño effect to the west.
Places that have formed deserts in the rain shadow of mountains could well become rainforests, and vice versa - perhaps. Again, it's too chaotic to know.
What I'm trying to get at is that this isn't as simple as "the sun rises on the other side" - everything would change.
By doomed I mean : everything living on it at the moment of the impact will no longer be living. The Earth as a big ball of rocks and metal will be just fine apart from a big bruise. Which impact ? Well...
The Earth is currently spinning faster than the Moon, in the same direction. This causes the Moon to be accelerated (and the Earth decelerated), making it go further away a few centimeters per year.
Now, if you reverse the Earth rotation, you'll have the opposite effect, slowing down the Moon until it is pulled too close for comfort. Really, really to close.
Of course, this would take quite a bit of time. Phew...
Physically all that would be different are the inversion of long term weather system and Coriolis effect, the sun would rise west and set east and that would be it. For example; tradewinds would blow in the opposite direction. A low pressure area on the northern hemisphere would turn clockwise instead of counterclockwise and that goes for all systems. Water would show the same thing when drained, spinning the other way around than it does now.
Oceanic currents would remain as usual as they are powered by convection caused by warm water having a lower density than cold water. They are not connected to the spinning of the earth as much as air currents are, it has more to do with the geography of the ocean floor.