He was aided in his work on the calendar by his mother Maria Margarethe Kirch and his sister , just like he and his mother once helped his father .
After his death in 1716 Christfried Kirch , the son of Gottfried Kirch , became his successor .
Gottfried Kirch was aided in Gottfried Kirch 's work on the calendar by his mother Maria Margarethe Kirch and his sister , just like he and his mother once helped his father .
After his death in 1716 Christfried Kirch , the son of Gottfried Kirch , became his successor .