What Are Decans In Astrology?

In Astrology, decans refer to the division of each zodiac sign into three equal parts (triplicities), each approximately ten degrees wide. These subdivisions provide further nuance and depth to the characteristics associated with each sign. Each decan is ruled by a different planet and imbued with its unique energy, adding layers of complexity to the interpretation of a birth chart.

Decans allow us to analyse the finer nuances of a person's personality, providing more detailed insights into their traits, behaviours, and tendencies.

 Below is a chat detailing the degrees and the 3 decans:

For example, someone with their Sun in the first decan of Aries (their sun is between 0-9 degrees) may exhibit the fiery and assertive qualities associated with Aries more prominently than someone born in the second or third decan.

Furthermore, decans can influence the expression of other planetary placements within a birth chart. For instance, if a person has their Moon in the third decan of Scorpio, they might display the intense emotional depth and transformative tendencies associated with Scorpio more prominently than someone with their Moon in the first or second decan.

Decans are often used to refine their interpretations and provide more accurate insights into a person's personality, motivations, and life experiences. 

Often in a straight woman's chart, the decan of her Sun can indicate what type of man she is attracted to.

Here is a chart example:

This chart shows a Libra Sun at 25 degrees. This is considered a 3rd decan Sun and therefore ruled by Mercury. Having the sun in the 3rd decan highlights the need for communication, learning and interaction with others. This would be different to a 1st decan libra which would highlight creativity, beauty and relationships.