Decan
Glossary · Last updated: 2026-07-26
Each zodiac sign is divided into three decans of ten degrees each. Decans add a sub-ruler planet and nuance beyond broad sun-sign blurbs.
Decans matter most when you know exact birth degree from a full chart. Date-only tools usually stay at whole-sign level.
Historical layers
Hellenistic and Egyptian decan lore fed medieval astrology. Modern apps rarely surface decans unless you open detailed chart software.
Related
Main reading and tools
These are the main reading and calculator pages. Use them for a daily note, a birth-sign tool, or a pair check.
- Today's Horoscope hubAll twelve Western sun-sign daily pages, plus links into the seven-tradition reader.
- Horoscope & Zodiac CompatibilityTwo birth dates for Western, Chinese, and Vedic folk pairing, plus every sun-sign hub.
- Zodiac Sign CalculatorWestern sun sign from birth date, with element, modality, and ruler.
- Vedic Rising Sign CalculatorLagna estimate when you have birth date, time, and place.
- Vedic Moon Sign CalculatorJanma Rashi and nakshatra when birth time and city are available.