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But the ball still travels 9 percent farther at 5,280 feet than at sea level. It is estimated that a home run hit 400 feet in sea-level Yankee Stadium would travel about 408 feet in Atlanta and as far as 440 feet in the Mile High City.

However, it's important to note that the wind can easily play a much greater role than altitude in turning fly balls into home runs. The same 400-foot shot, with a 10-mph wind at the hitter's back, can turn into a 430-foot blast. (A 10-mph wind is close to the average prevailing wind in the United States.) So, it's easy to see how a good tailwind can beat high altitude for home-run hitting any day.

Another important effect of altitude on baseball is the influence thinner air has on pitching. In general, curve balls will be a little less snappy, and fastballs will get about an extra six inches of giddy-up due to the decrease in resistance the thinner air provides.

So, fasten your shoulder harnesses, keep both hands on the bar in front you at all times, and enjoy the ride.