Centaurus

Definition

A large southern constellation south of Hydra and Libra, containing Alpha Centauri (the closest stellar system to the Sun) and Hadar (Beta Centauri). Conventionally identified in Greek-mythological reception with a centaur figure. Centaurus is one of the southern Ptolemaic 48-constellation catalog members enumerated by Abu Ma'shar in the Great Introduction. Identification of Centaurus stars also appears in Egyptian-astronomy reception via Leitz's (1995) Ramesside-table star-clock projections discussed in Belmonte-Lull.

In Tradition

Across the Arabic-Persian transmission of the Ptolemaic 48-constellation catalog (Abu Ma'shar) and the Egyptian-astronomy decan-coordinate reception (Belmonte-Lull on Leitz 1995), Centaurus is named through its canonical Ptolemaic constellation-membership and through specific named stars at southern coordinates. The constellation has no canonical zodiacal placement in the Hellenistic per-degree paranatellonta tradition; readings use fixed-star projection of Alpha Centauri or Hadar onto the ecliptic.

In Practice

Astrologers using fixed-star technique read Centaurus through Alpha Centauri and Hadar (Beta Centauri), projecting these stars onto the ecliptic at their precessionally-adjusted longitudes for natal and event-chart work. Abu Ma'shar's Great Introduction enumerates Centaurus among the 15 southern Ptolemaic constellations, in the §1.10 naming-only mode where the author defers per-constellation interpretive doctrine to a later work. Egyptian-astronomy reception (Belmonte-Lull on Leitz 1995 Table 4.6) projects certain Ramesside-table Egyptian star-clock positions 'far southwards into Centaurus' (Q4 mnjt = ξ Cen) — projections Belmonte-Lull explicitly flag as 'controversial' and inconsistent with their preferred boreal-constellation reconstruction. The Chiron-myth framing (centaur as the wise teacher-healer wounded in interaction with Hercules) is part of the broader Western reception that subsequent post-1977 modern-Western practice attaches to the Chiron-minor-planet rather than to the Centaurus constellation specifically.

Historical Origin

The Centaurus naming in the Ptolemaic 48-constellation catalog is preserved across the Arabic-Persian transmission via Abu Ma'shar's Great Introduction (9th c.), which enumerates the 15 southern Ptolemaic constellations including Centaurus. The Leitz 1995 Ramesside-star-clock projections into Centaurus are documented in Belmonte and Lull's *Astronomy of Ancient Egypt* (Springer 2023), with Belmonte-Lull's editorial caveat that this projection scheme is controversial.

Etymology

Origin: Greek / Latin. Meaning: From Greek Κένταυρος (Kéntauros); Latin Centaurus. Conventionally derived from Greek-mythological reception of the half-human, half-horse centaur figures..

Further Reading

• Abu Ma'shar, The Great Introduction to Astrology
• Juan Antonio Belmonte & José Lull, Astronomy of Ancient Egypt