Mars: according to Viking 1 Orbiter

NASA's Viking Mission to Mars was composed of 2 spacecrafts: Viking 1 and Viking 2, each consisting of an Orbiter and a Lander.
The primary mission objectives were to obtain HR images of the Martian surface, characterize the structure and composition of the atmosphere and surface, and search for evidence of life. Viking 1 was launched on August 20, 1975 and arrived at Mars on June 19, 1976. The first month of orbit was devoted to imaging the surface to find appropriate landing sites for the Viking Landers. On July 20, 1976 the Viking 1 Lander separated from the Orbiter and touched down at Chryse Planitia (22,48° N, 49,97° W planetographic, 1,5 Km below the datum - 0 elevation). Viking 2 was launched September 9, 1975 and entered Mars orbit on August 7, 1976. The Viking 2 Lander touched down at Utopia Planitia (47,97° N, 225,74° W, 3 Km below the datum) on September 3, 1976. The Orbiters imaged the entire surface of Mars at a resolution of 150 to 300 meters.