Mercury Orbit Chart MOC-4, for the Mercury Atlas 8 mission. USAF Aeronautical Chart and Information Center, June 1962. 8.5 x 32 in., color. Plots all six planned earth orbits of the mission and gives overlapping longitudinal coverage (0 to 360 degrees) and latitude coverage from 45 degrees north and south with circular plots representing the ground communication coverage areas. INSCRIBED AND SIGNED BY WALLY SCHIRRA at the bottom center with: ''The six orbits of Sigma Seven - Wally Schirra.'' He has added the date and time of his launch at the Cape Canaveral area and his flight time ''9 hr 13m'' at the splashdown bull's eye just northeast of Midway Island in the Pacific.