Katlenburg-Lindau is a municipality in the Landkreis (district) of Northeim in Lower Saxony, Germany. It is situated approximately 10 km southeast of Northeim, and 20 km northeast of Göttingen. Katlenburg-Lindau was formed on 1 March 1974 from the formerly independent communities of Katlenburg-Duhm, Gillersheim, Berka, Elvershausen, Wachenhausen, Suterode and Lindau. With the exception of Lindau, which had belonged LandkreisDuderstadt (itself formerly part of the Eichsfeld), these communities were part of Landkreis Northeim. The Max Planck Institute for Solar System Research (Max-Planck-Institut für Sonnensystemforschung) of the Max Planck Society was located in Lindau from 1946 to 2014, when it was moved to Göttingen. Until June 2004 the MPI was known as "Max-Planck-Institut für Aeronomie".