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An appeal 1 was made in 1926 by Professor E. W. Brown for more observations of lunar occultations in order to provide material for the study of the unexplained divergence of the Moon from its predicted orbit. The observation of occultations requires only relatively simple equipment and their unique value has been demonstrated by the conclusions drawn by Professor Brown from a discussion of the results for the years 1923 todoi:10.1086/123897 fatcat:hpvwkkttd5a6fnnabde7yzl6s4