The graphic ephemeris
An instrument of Reinhold Ebertin's Cosmobiology
Reducing every planet's longitude to a 45° or 90° scale and plotting it across a year turns the ephemeris into a diagram where transits and directions are read at a glance. Ebertin developed it within Cosmobiology alongside the 90° dial; his 90° working-instrument booklet first appeared in 1949. It is a published technique of the German cosmobiology school, not any modern software vendor's invention.
What it measures
Each body's ecliptic longitude taken modulo 45° or 90° and drawn against time. Where two lines cross, the bodies are in hard aspect — at the 90° modulus a crossing is a conjunction, square or opposition, since all three fold onto the same point. Overlaying natal positions as fixed lines turns it into a personal forecast diagram.
Sources
- Reinhold Ebertin, Das 90°-Arbeitsgerät in der Praxis (Kosmobiologische Studien I) (1949)