Career
Von Zeipel participated in scientific expeditions to Spitzbergen in 1898, 1901, and 1902. He worked at Stockholm Observatory from 1897 to 1900, at Pulkovo Observatory from 1901 to 1902, the Paris observatory from 1904 to 1906, and the Uppsala Astronomical Observatory from 1911. His fields of study were celestial mechanics, astrophotography, and theoretical astrophysics.
He proved a key theorem about the Painlevé conjecture.
The crater Von Zeipel on the Moon is named after him. 8870 von Zeipel is an asteroid discovered on March 6, 1992.
lieutenant is also named after him. Von Zeipel theorem, linking stellar radiative flux to local effective gravity.