1. A passive optical crosswind profiling system comprising: A) at least one telescope defining two apertures separated at a distance and adapted to collect light along at least two separate paths from a field of view containing a target, B) at least one high-speed digital camera defining at least one many pixel sensor wherein pixels of said at least one many pixel sensor are identified as separate blocks of pixels, C) an optical system for focusing light collected along said at least two separate paths by said at least one telescope onto said at least one many pixel sensor to produce at least two images of the target scene, D) a high-speed computer processor programmed to with a special block matching correlation algorithm to correlate image data collected the separate blocks of pixels in order to determine time required for horizontal and/or vertical shifts of blocks of images caused by air turbulence producing spatially-varying tilts and/or phase gradients in images detected by at least two of the separate blocks of pixels across the apertures of the at least one telescope to calculate a crosswind profile at multiple locations along a path between said system and said target.