Hawkins applied the technological resources of the university to studying the astronomical alignments of ancient megalithic sites. He fed the positions of standing stones and other features at Stonehenge into an early IBM 7090 computer and used the mainframe to model sun and moon movements. In his 1965 book, "Stonehenge Decoded", Hawkins argued that the various features at the monument were arranged in such a way as to predict a variety of astronomical events. This idea was briefly mentioned in his 1961 book, Splendor in the Sky (p23).