Chaldean Order

greek: Χαλδαϊκὴ τάξις (Chaldaikē taxis) · latin: ordo Chaldaicus

Definition

The Chaldean order is the sequence of the seven traditional planets arranged by apparent geocentric speed from slowest to fastest: Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon. The same ordering, read outward from Earth instead of by speed, gives the classical sphere arrangement (Moon nearest Earth, Saturn furthest). Lehman: the order 'structures the face rulers (reading left to right in the face table), the planetary hours (same left-to-right sequence), and the planetary days of the week.'

In Tradition

Across Hellenistic, Arabic, and Western traditions the Chaldean order is the structural backbone of three distinct planetary-rotation doctrines: face (decan) rulership from 0° Aries, planetary hours through the day, and planetary days of the week. Obert reads the order cosmologically as the Spirit-Matter polarity, with Saturn bordering the fixed-star sphere and the Moon nearest Earth.

In Practice

You compute the planetary day by taking the planet ruling the first hour of daylight; you compute the planetary hour by stepping through Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon repeatedly from sunrise, with each hour assigned the next planet in the cycle. Faces (decans) assign Mars to the first face of Aries and step through the same order across all 360°, so Sunday's first hour is the Sun, Monday's the Moon, and so on. The same order underlies modern electional practice: choosing a planetary day-and-hour aligned with the matter at hand (e.g., Jupiter's hour on Jupiter's day for an expansive venture).

Historical Origin

Named for the Chaldeans (Babylonian astronomer-astrologers), the order is preserved through Ptolemy, Firmicus, Bonatti, and medieval compilators as the canonical planetary sequence. Bonatti's Liber Astronomiae Vol XI Part III Ch XI documents both the day-rulership and hour-cycling applications; the Zoller translation of Liber Hermetis Chapter I uses the same sequence (starting from Mars) for decanic-rulership assignment.

Etymology

Origin: Greek / Latin. Meaning: Named after the Chaldeans, the Hellenistic-era term for the astronomer-astrologers of Babylon, to whom the planetary-speed sequence was traditionally attributed..

Further Reading

  • Guido Bonatti, Liber Astronomiae
  • Lee Lehman, Essential Dignities
  • Charles Obert, The Classical Seven Planets