Doppler shifts of the solar Fe line 630.15 nm relative to the terrestrial O2 line 630.2 nm were determined at many positions on the solar disk to investigate the rotation of the solar plasma and locate large-scale plasma motions. The spectrum was measured by a self-scanning linear photodiode array with 128 diodes; and average rotation velocity of

In an attempt to elucidate the daily fluctuations seen in the 1980 drift time data (August 30-September 13) and to monitor the solar diameter for an interval as long as possible, visual drift timing observations were made on 46 consecutive days, from May 16 to June 30, 1981. A total of 2091 visual drift times (including 11 doubtful ones) was

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The design and construction of an asteroid-borne giant optical telescope, and a multi-antenna ultra long baseline free-flying radio interferometer are described. The large scale and extreme tolerance of each instrument will require fabrication in space from nonterrestrial materials, and novel features of optical design. Details of the capabilities