Decennials

greek: Δεκαετηρίδες (Dekaeteridēs)

Definition

Decennials is a Hellenistic timing system — a "time-lord" technique, which hands successive stretches of life to different planets to govern. Valens, in his Anthologiae, credits it to Abraham. It divides life into ten-year blocks and shares each block among the seven traditional planets in graded sub-periods. Its Greek name is dekaeteridēs. Each ten-year block has one ruling planet — chosen by looking at sect (day or night birth) and angle position against the chart's lights — and through that ruler the seven planets take turns as sub-period lords, with the ten years parcelled out by the planetary minor-years scale.

In Tradition

Among the Hellenistic time-lord methods, decennials stands alongside zodiacal releasing, profections, and primary directions as a way of bringing a chart's features to life across time. Valens uses it to read the qualitative feel of each ten-year stretch: the ruler of the decade sets the main theme, while the rotating sub-period lords mark shorter shifts within it. The Hellenistic-Persian transmission keeps the technique as a companion to the firdaria, another planet-by-planet distribution of years.

In Practice

You first find the chart's sect light — the Sun for a day birth, the Moon for a night birth — and judge how close it sits to an angle, which sets the starting decennial ruler by the rules Valens hands down. The ten-year block is then shared among the seven traditional planets following the minor-years scale (Sun 19, Moon 25, Mercury 20, Venus 8, Mars 15, Jupiter 12, Saturn 30, used as proportions). Each sub-period brings that planet's significations to the fore within the wider theme the decade's ruler has set. Modern Hellenistic-revival astrologers run it alongside zodiacal releasing for layered timing, though in everyday practice it is used less often than profections.

Historical Origin

Decennials are set out systematically in Vettius Valens' Anthologiae (c. 145-175 CE), where Valens credits the doctrine to the legendary Abraham. The technique survives only in fragments through the Arabic-Persian transmission, and was recovered for modern practice through the Project Hindsight Valens translations (Schmidt, 1990s) and Brennan's synthesis in Hellenistic Astrology (2017).

Definition

In Tradition

In Practice

Historical Origin

Further Reading