Hellenistic
The astrology of the Greek-speaking Mediterranean from roughly the 1st century BCE to the 7th century CE, as recorded by authors such as Vettius Valens, Dorotheus and Ptolemy.
1 Oct 2026
A Leo Sun and a Sagittarius Moon share the fire element: Sagittarius is four signs ahead of Leo, a trine, a harmonious configuration for Hellenistic astrologers. The Moon has no domicile, exaltation, detriment or fall in Sagittarius, though the Sun is in its own domicile, the sign it rules. The Moon stands roughly 90° to 150° ahead of the Sun along the zodiac, roughly the waxing gibbous stretch, but sign distance is coarse. Jupiter, the planet that rules Sagittarius, is a benefic and a day-team planet, as the Sun is, while the Moon is on the night team. That grouping is sect, the tradition's sorting of planets into day and night teams. In Dorotheus' triplicity scheme the Sun rules the fire signs by day and Jupiter by night. The tradition looks next to Jupiter's placement.
A note on “detriment”: the early Hellenistic texts note a planet opposite its own sign without naming it. The term is defined only in late and medieval sources, and scholars disagree on whether the idea was implicit earlier.
Sources
- Ptolemy, Tetrabiblos, Book I
- Dorotheus of Sidon, Carmen Astrologicum
- Chris Brennan, Hellenistic Astrology: The Study of Fate and Fortune (2017)
What was checked
An AI research review checked this text against sources on 1 Oct 2026. No person has reviewed it.
Reviewer's notes
Sign-count configurations (Ptolemy I.13, I.16) and Moon-phase ranges (rechecked by arithmetic against the Sun in Leo and the lunar-phase angles) hold. Changed 'easiest' wording to Ptolemy's 'harmonious' where it appeared. Dorotheus' triplicity lords confirmed.
Sources consulted
- Ptolemy I.5-7, 11-13, 16-19: benefic/malefic, sect, solid/bicorporeal and masculine/feminine signs, aspects, disjunct signs, houses, exaltations and depressions penelope.uchicago.edu (opens in a new tab)
- new 0, first quarter 90, full 180, last quarter 270 deg Sun-Moon elongation; waxing/waning en.wikipedia.org (opens in a new tab)
- Dorotheus Book I.1 (Pingree): fire triplicity lords by day Sun, Jupiter, Saturn; by night Jupiter, Sun, Saturn skyscript.co.uk (opens in a new tab)
- Paulus' Introductory Matters covers the lunar phases, sect and aspects, and chart-rulership en.wikipedia.org (opens in a new tab)
- confirms Brennan, Hellenistic Astrology: The Study of Fate and Fortune (Amor Fati Publications, 2017) exists; topic coverage taken from the Brennan-hosted Astrology Podcast pages above astrologynewsservice.com (opens in a new tab)