Cosmobiology (Ebertin)

Cosmobiology is a direction in astrology developed by the German astrologer Reinhold Ebertin (1901–1988) as an attempt to create a more rigorous, verifiable astrology free from symbolic arbitrariness.

A radical break. Ebertin abandoned the house system (considering it unreliable due to its dependence on exact birth time), discarded most traditional concepts, and focused on mathematically precise midpoints of planets as sensitive points of the chart.

The Cosmogram — Principal Tool

A circle without houses. The cosmogram is a 360-degree circular diagram without house divisions, on which planetary positions are plotted and midpoints between every pair of planets are calculated.

Examples of midpoints:

• Sun/Moon — the combination of vitality and soul principles
• Mars/Saturn — the principle of restricted force

Active configuration. When another planet falls on a midpoint or forms a 45/90/135-degree angle with it, this is regarded as an active configuration.

The main work. The research was systematized in "The Combination of Stellar Influences" (COSI, 1940).

Attempts at Verification

A unique case among astrologies. Ebertin and his followers (including the Working Group for Cosmobiological Research, WAWI) undertook attempts at statistical verification — which favorably distinguishes cosmobiology from most astrological schools.

Results. Have not fully passed independent scientific review. Nevertheless, the method is respected in the professional astrological community for its mathematical rigor and pragmatism.

Place in Errarium

The German rationalist branch. In Errarium, cosmobiology (#42) represents the German rationalist branch of astrology — fundamentally different in spirit from psychological astrology or traditional symbolic systems.

Analog — harmonic astrology. Its closest analogue is harmonic astrology (#44) as another attempt to mathematically formalize astrology. Both work with numerical relationships within the chart while avoiding excessive symbolism.