Johannes Franz Hartmann (11 January 1865 – 13 September 1936) was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta...

Johanne, Johannes, Johan, or Johanes Hartmann may refer to: Johannes Hartmann (1568–1631), German chemist Johannes Franz Hartmann (1865–1936), German...

an array of holes in a mask that had been developed in 1904 by Johannes Franz Hartmann as a means of tracing individual rays of light through the optical...

somewhat irregular. The crater was named after German astronomer Johannes Franz Hartmann in 1970. Prior to that, this crater was designated Crater 217....

Hartmann mask is a tool to help focusing telescopes, mainly used by amateur astronomers. It is named after the German astronomer Johannes Franz Hartmann...

Johannes Hartmann (1568–1631), German chemist Johannes Franz Hartmann (1865–1936), German astronomer active in Argentina and namesake of the Hartmann...

diameter. It was discovered on 28 April 1924, by German astronomer Johannes Hartmann at the La Plata Astronomical Observatory in Argentina. It was named...

Observatory) DMP · 964 965 Angelica 1921 KT Angelica Hartmann, wife of the discoverer, Johannes Franz Hartmann (1865–1936) DMP · 965 966 Muschi 1921 KU German:...

1904 when Johannes Franz Hartmann using photographic plates taken at Potsdam Observatory showed that the orbital period was 5.7 days. Hartmann also noticed...

Erich Alfred Hartmann (19 April 1922 – 20 September 1993) was a German fighter pilot during World War II and the most successful fighter ace in the history...