Patent ID: 6810594
Filing Date: 2004-11-02
Classification: G01C

Abstract:
An astronomical, particularly solar and/or lunar, goniometric indicator comprising a reflecting member (1; 16; 20) and an indicating member (1; 16; 20; 27), the reflecting member (1; 16; 20) having at least one planar surface scored with substantially circular and concentric microgrooves, wherein the width and the depth of each microgroove and the distance between adjacent microgrooves are adapted to let a diametral line of diffracted and/or reflected light appear when said at least one planar surface is illuminated by a light source, the reflecting member (1; 16; 20) having at least one orientation graphic sign (2; 17; 26), the indicating member (1; 16; 20; 27) including at least one graduated scale.