Originally Posted by tennis_ocd
It was ok for a seat-of-the-pants, topspin "feel" approach. For any real relevancy to the rec game you'd have to account for changes of acceleration due to latitude position.
A concise and shrewd commentary. There should almost be a "warning" tag attached to the formula to guard against people applying a N 38° 41.130586' approach to a clearly N 37° 41.130586' location. That's true situational hitting.