AS17-152-23279 (7-19 Dec. 1972) --- Eclipsed by the silhouetted horizon of the moon, the crescent Earth appears in the shape of a Viking's headwear in this unusual Apollo 17 photograph. The three astronauts--Eugene A. Cernan, Ronald E. Evans and Harrison H. Schmitt--were just about to begin their journey homeward following the successful lunar landing phase of their mission.