astronomer, an expert on Saturn. His other work was largely concerned
with features of the Solar System, although he shared the family interest
in stellar astronomy.
Struve was born in Pulkovo, near St Petersburg, and studied at Dorpat
(now Tartu, Estonia), travelled in Europe and visited major centres
of astronomical research. He began his career at Pulkovo Observatory
(founded by his grandfather Wilhelm von Struve), becoming its director
1890. In 1895 he moved to Germany, first as professor at Königsberg,
and from 1904 as director of the Observatory of Berlin-Babalsberg (the
Neubabalsberg Observatory from 1913).
Among the many features of the Solar System studied by Struve were the
transit of Venus, the orbits of Mars and Saturn, the satellites (especially
Iapetus and Titan) of Saturn, and Jupiter and Neptune. Struve's 1898
paper on the ring system of Saturn formed the basis of much of his later