Why Do We Use MPH?
The Hot Stove is still pre-heating, so while we wait on the oven timer, let’s reflect on a topic that we rarely question. Provocative title aside, why do we use miles per hour, more commonly referred to as mph, to talk about velocity in baseball? After all, it’s a game of feet, inches, and seconds.
It’s 60 feet, six inches from the rubber to the back corner of the plate. Home to first is 90 feet. Home to second is 127 feet, three and 3/8’s inches, which can also be expressed as 90 times the square root of two (h/t Pythagoras). The outfield fence is typically somewhere between 310 and 410 feet from home plate. A really long home run will travel 500 feet in about four to six seconds. Billy Hamilton can steal second base in 3.1 seconds. When Jose Fernandez hits a home run, it takes him about 28 seconds to wander around the bases.
In other words, no other single activity in baseball is meaningfully measured using miles or hours.
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