<title>Space instrument for astrometric measurement of the sun and stars</title>

Abstract

In the XX Century in Astrometric observations of the Sun participated more than 14 observatories. It were obtained about 31000 astrometric positions of the Sun, some observatories were very active (U.S. Naval Observatory--7490 observations, Pulkovo Observatory--5495 observations, Nikolaev--3948 observations etc.).