At a hearing on the Agreement Governing the Activities of States on the Moon and Other Celestial Bodies (the Moon Treaty), adopted by the UN General Assembly on December 5, 1979, which the Subcommittee on Science, Technology, and Space of the Senate Committee on Commerce, Science, and Transportation held on July 29, 1980, S. Neil Hosenball, General Counsel of the National Aeronautics and Space Administration and U.S. representative on the UN Outer Space Legal Subcommittee, stated that interpretation of the Agreement depended upon its negotiating history as required by the Vienna Convention on the Law of Treaties (1969) and by customary international law.