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This picture of the lunar surface was photographed by astronaut John W. Young during Apollo 16's first extravehicular activity (EVA) at EVA Station No 1. The instrument near the small crater's edge (foreground) is a gnomon. While astronauts Young, commander; and Charles M. Duke Jr., lunar module pilot; descended in the Apollo 16 Lunar Module (LM) "Orion" to explore the Descartes highlands landing site on the moon, astronaut Thomas K. Mattingly II, command module pilot, remained with the Command and Service Modules (CSM) "Casper" in lunar orbit.