At Berlin Observatory he began his duties as assistant of the first direktor Gottfried Kirch and after the latter's death in 1710, he succeeded him as director and continued the main exercise of up till his own death.
In 1740 after the death of Christfried Kirch he was named as his successor as Director of Berlin Observatory - a post which he held for the rest of his life.
The concert (organized by musician Lutz Ulbrich) took place at the planetarium of the Wilhelm-Foerster-Sternwarte.
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Also in 1716, Maria's son Christfried became the director of Berlin Observatory of the Royal Academy of Sciences following Hoffmann's death and Maria and her daughter, Christine, became his assistants.