Early official staple-bound softcover NASA technical note entitled "Three-Dimensional Trajectory Analysis for Round-Trip Missions to Venus (NASA TN D-1319)" by Charles L. Zola and Gerald Knip, Jr., of the Lewis Research Center in Cleveland, Ohio, 7.75 x 10.25, 105 pages, dated August 1962. The document offers a study of the trajectory requirements for an ambitious interplanetary trip to Venus, filled with dozens of charts and graphs evaluating trip times for Earth-Venus and Venus-Earth voyages. In very good to fine condition, with creasing to the lower right corners, light wear to covers, and a couple notations to the upper left corner of the front cover.
Venus became the first planet to be explored by a spacecraft when NASA’s Mariner 2 successfully flew by the planet at a range of 21,660 miles on December 14, 1962. However, no round-trip mission has ever been undertaken.
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