His assistant Johann Heinrich Hoffmann moved up to replace him as the head of the observatory .
Gottfried Kirch died in 1710 , a year before the official opening of the Academy and the Observatory .
Gottfried Kirch 's assistant Johann Heinrich Hoffmann moved up to replace him as the head of the observatory .
Gottfried Kirch died in 1710 , a year before the official opening of the Academy and the Observatory .