Decan
Glossary · Last updated: 2026-07-26
Each zodiac sign is split into three decans of ten degrees each. Decans add a sub-ruler planet and extra detail 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.
Example: see it on a birth date
Decans split each sun sign into three slices of about ten days. November 11, 2021 has the sun sign Scorpio, which is one whole sign made of three decans.
The decan is a finer slice inside the sun sign. It is not a separate zodiac.
Enter your own date on the Zodiac Sign Calculator.
Historical layers
Hellenistic and Egyptian decan stories fed medieval astrology. Modern apps rarely show 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 to the seven-tradition reader.
- Horoscope & Zodiac CompatibilityTwo birth dates for Western, Chinese, and Indian Vedic pairing, plus every sun-sign hub.
- Zodiac Sign CalculatorWestern sun sign from birth date, with element, modality, and ruler.
- Rising Sign CalculatorIndian Vedic Lagna estimate when you have birth date, time, and place.
- Moon Sign CalculatorIndian Vedic Janma Rashi and nakshatra when birth time and city are available.