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The seismometer reading from the impact made by the Apollo 15 Saturn S-IVB stage when it struck the lunar surface is studied by scientists in the Mission Control Center. Dr. Gary Latham (dark suit, wearing lapel button) of the Lamont-Doherty Geological Observatory (Columbia University) is responsible for the design and experiment data analysis of the Passive Seismic Experiment (PSE) of the Apollo Lunar Surface Experiments Package (ALSEP). The S-IVB impact will assist in calibrating the Apollo 14 PSE readouts as well as providing comparative reading between Apollo 12 and Apollo 14 seismometers forming the first two stations of a lunar surface seismic network. (The Apollo 11 seismometer is no longer functioning.) The man on the left, writing, is Nafi Toksos of the Massachusetts Institute of Technology. Looking on at upper left is Dave Lammlein, also with the Lamont-Doherty Geological Observatory. The Apollo 15 S-IVB impacted at 79:29:40 ground elapsed time at 11.8 degrees west longitude and 1.0 degree south latitude. The Apollo 15, Apollo 14, and Apollo 12 seismometers will register the lunar impact of the Apollo 15 Lunar Module ascent stage.