He later worked at the Göttingen Observatory where he tried to develop a method to measure the UV radiation of the Sun.

Kiepenheuer also improved aerial cameras and tested them during World War II in high-altitude flights over the United Kingdom.

By 1942, this network spanned from Simeiz in the Crimea in the east to Paris in the west, and from Tromsø, Norway in the north to Syracuse, Sicily in the south.

After the war, Kiepenheuer benefited from his close connections with researchers all over Europe and managed to slowly establish a scientific network for solar observations.

After his death, a new telescope was built on the Spanish island of Tenerife, and therefore, the outdated observatory at Capri was closed in 1988.