1. A method for determining the trajectory of a projectile on a ballistic trajectory, comprising: capturing a timed sequence of image frames of the projectile in flight, each image frame comprised of pixels; comparing the grey-scale intensity of pixels at corresponding positions of each image frame of the sequence to arrive at a composite representing maximum intensity pixels; determining the times at which each such maximum intensity pixel was captured; calculating at least one array of test pixels corresponding to at least one estimated trajectory of the projectile; comparing the at least one array of test pixels to the times of the maximum intensity pixels to determine pixel matches; using the pixel matches to arrive at a score for each such estimated trajectory; selecting a best-fit estimated trajectory based on the score for such estimated trajectory.