Decans
Each zodiac sign is divided into three 10-degree segments called decans, each with its own planetary ruler. Compare two classical systems.
The oldest decan scheme. Rulers follow the classical seven-planet order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — cycling through all 36 decans from the first decan of Aries. The Egyptian 36 Faces tradition assigns exactly the same rulers, so both are shown under one heading.
ⓘ How to find your decan
Each sign spans 30° and splits into three 10° decans: 0°00′–9°59′ → 1st decan, 10°00′–19°59′ → 2nd decan, 20°00′–29°59′ → 3rd decan. Example: a planet at Taurus 14°23′ sits in the 2nd decan of Taurus; its ruler depends on the system you select.
Aquarius
References
Chaldean: the classical seven-planet order scheme (Firmicus Maternus; Ptolemaic tradition). The Egyptian 36 Faces tradition matches the Chaldean ruler assignments exactly, so it is not listed as a separate option. Triplicity: assigns each decan to a sign of the same element and its classical ruler (Ptolemy). Note: the technique with unequal degree segments is not decans but the 'terms' (bounds) — a separate technique. Decans are 10° in every system.
The 10° sub-divisions of each sign and their rulers.
For those who want to understand themselves and their personal chart in depth.
Date, time, place
Related Tools
Save Your Chart
Save your birth details once and reuse them across every tool.