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This report reviews briefly the works achieved or planned in the triennium from 1979 to 1981 on the subjects to be considered by Commission 31. Reports of contributions furnished kindly from different institutions by many of Commission members were obliged to be partly omitted or abbreviated owing to the limitation of space, for which hearty thanks and apologies as well are to be given.
Astronomical observations for UTO-UTC have been continued on a routine basis in participating observatories to BIH with PZT's, astrolabes, transit instruments etc. The observations with 35-km interferometer have been made by USNO, and are expected to contribute an important part to future efforts.