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have been the most difficult to fill among
all those who have contributed to the ad-
vance of astronomical knowledge. He was
born at Wiel, in the Duchy of Wurtem-
berg, in 1571. He held an appointment at
Gratz, in Styria, and went to join Tycho
Brahe in Prague, and to assist in reducing
his observations. These came into his pos-
session when Tycho Brahe died, the Em-
186