Outstanding!
One question on the article, how would the curvature of the earth affect a long distance shot? Something along the lines of how gravity affects shooting uphill vs. downhill?
C'mon... everyone knows the earth is flat. Point A to point B. Of course the rotation of the earth would have to be considered.
The guy had to stay still for over 10 seconds so it's not like he was running on the battlefield.
Don't need to be still. If walking, the stride is factored in.
That's what separates a good shooter from a paper target queen.
Then again, all targets should remain still. It reduces the required skill of the shooter. Maybe, if asked nicely...