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I have heard it said many times, that snipers have to take into consideration the "coriolis effect" when firing at long range.  The coriolis effect is described as:

 

 "an effect whereby a mass moving in a rotating system experiences a force (theCoriolis force ) acting perpendicular to the direction of motion and to the axis of rotation. On the earth, the effect tends to deflect moving objects to the right in the northern hemisphere and to the left in the southern and is important in the formation of cyclonic weather systems."

 

Given that I a not a sniper, I cannot verify, that snipers do indeed adjust for such an effect, or that the adjustment that they are making, if any, is due to rotating earth and not some other factor.  In truth, I've never spoken with a trained sniper and have only heard of this from people who do not shoot at these long distances.  As, such I have good reason to doubt that it is true.

 

If the coriolis effect has to be taken into account by snipers, it would logically be necessary for other missile systems to account for this force.  However, according to Sean McCrary who is a NATO Sea Sparrow Surface Missile System Instructor and Master Training Specialist, there is no Coriolis Effect taken into account with these ranged weapon systems which he has been working with for 10 years.  To listen to Sean talk about the coriolis effect please watch this video which is a compilation of several interviews.  (attach video here)

 

Below are some videos, one is a humerous take on the idea, the other is a testimony of someone who spoke with a US sniper, who says they do not accont for any such effect, and a missile instructor who also ays they do not make any calculations for curvature or rotation of the earth.