1. Apparatus for detecting the location of an object in a selected area comprising: flying spot scanner means for point by point scanning of said area; a plurality of non-concentric sensor means spaced about said area such that each senses an independent shadow on a common perspective of said object in response to the point by point scanning of said flying spot scanner means; and means for combining the point by point output of said sensor means to derive a resultant indicative of the location of said object.