1. A method for estimating line-of-sight rotation rate for use in tracking, approaching, pursuing, intercepting, or avoiding an object; said method comprising the steps of: with an imaging sensor fixed to a vehicle that is approaching or receding from the object, recording a series of images of the object together with a background; based on computations made from the images exclusively, with no direct information about inertial angular body rate or gimbal angle, estimating line-of-sight rotation rate of the object relative to the vehicle; and applying the estimated line-of-sight rotation rate to track, approach, pursue, intercept or avoid the object.