The inability to obtain information about work in other countries, under present world conditions, necessarily makes this report incomplete. The conditions since the 1938 meeting have interfered seriously with major programmes of observation, and have delayed reductions, such that there are now several series of observations of the Sun, Moon, and Planets, and many catalogues of stars awaiting final reduction and publication.

The Sun, Moon, and Planets. Fundamental observations of these objects and of the fundamental stars have been carried on regularly at Cape and Washington, and at Greenwich except for part of the time during the war. The Greenwich and Cape results 1925–44 have been reduced; and summaries of the results have been published in reports. The Washington series 1928–32 is published; the series 1925–40 is about reduced; and the series 1935–45 is to be printed this year.