English: "As the Sun approaches the lunar horizon," GEORGE H. SUTTON, University of Hawaii, said of (this photo), "lengthening shadows emphasize the pockmarked and rubble-strewn character of the surface. Raised rims of several craters and angular outlines of many surface fragments stand out sharply. In addition to giving a clear impression of the nature of the lunar surface, the long shadows in such pictures, taken at low Sun angles, can be measured to determine shapes and sizes of surface irregularities, obtaining accurate estimates of the size distribution of fragments and the shapes of craters."