I've never used calculus in the real world either. I can barely remember what it was supposedly good for.
Acceleration based on position, or distance based on acceleration are two of the most useful in aerospace (obviously for nav / avionics).... but the computer doing the calcs would not be using calculus, rather numerical methodz. The big fallacy with calculus is you need to start with some equation that describes acceleration or position with respect to time. The only way to get these would be curve fitting data.... :eek: Just like in system trading, engineering all boils down to getting an intelligent fit to data, and knowing when a refit is called for.