Hamburg School of Astrology

[2] Early collaborators of Alfred Witte were Friedrich Sieggrün and Ludwig Rudolph, and the Hamburg School's first points beyond Neptune were posited during the astronomical searches leading to the 'discovery' of Pluto (and so classified as 'Transneptunians').

An increasing amount of the research of the Hamburg School revolved around astrological midpoints and use of the hypothetical planets.

In the 1930s, the American Richard Svehla gave lectures on the Hamburg School in the United States, translated the Rules for Planetary Pictures into English, and coined the term "Uranian Astrology" as the English name of the American branch of the school.

Witte is supposed to have committed suicide before he could be sent to a concentration camp, and Ludwig Rudolph was interned.

Reinhold Ebertin, a student of Hamburg School methods, eliminated the use of the hypothetical planets while maintaining the core teachings of the Hamburg School, renamed it "Cosmobiology" (German: Kosmobiologie), and published some of the observations in The Combination of Stellar Influences in 1940, last updated in English in 1972.