How to Track a Mortar in Flight

A Kalman filter uses past data or data you know about a system to predict what you're going to do in the future. This is how wars are fought. It's also how I catch footballs when they're throwing at me. When that guy moved his finger, I was facing a major leaguer in this particular batting cage session and he put the tiniest bit of cut on that low 90s fastball. No chance exceeded my calculation speed. The beautiful thing about swinging a bat is you have a pie shaped piece of space that the bat can occupy in the amount of time it takes for the baseball to traverse the plate.