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pbk. During the Apollo Program there were a number of unusual observations These unusual observations had not been published widely and are unknown to the world One of these observations is the problem of judging sizes and distances on the surface of the Moon All the astronauts who landed on the Moon had the problem of judging distances Neil Armstrong the first person to walk on the Moon had visited to a 180 m diameter crater called East Cater Apollo 12 astronaut Alan Nean said that moving on the Moon is so different from Walking or running on the Earth and it was difficult to say whether one had gone 500 feet or 1500 feet 144 pp.