Zodiac Decans
Not all Aries are the same. Each sign is divided into three 10-degree segments called decans, each with a unique sub-ruler that modifies the sign's expression. Explore all 36 decans below.
How to Identify Your Decan
Use your Sun's tropical sign and degree to identify its decan. Calendar dates are approximate; your birthday alone may not settle a boundary placement. If your birth time is unknown, a representative position near a boundary may leave your decan uncertain.
This collection uses modern triplicity: sub-rulers follow the signs of the same element. Other systems, including Chaldean decans, assign different rulers. The descriptions below are interpretive traditions, not measured personality traits. Compare the decan methods at Astrodienst.
♈
Aries 1st Decan
Approximate dates: March 21 – March 30
Ruler: Mars
♈
Aries 2nd Decan
Approximate dates: March 31 – April 9
Ruler: Sun
♈
Aries 3rd Decan
Approximate dates: April 10 – April 19
Ruler: Jupiter
♉
Taurus 1st Decan
Approximate dates: April 20 – April 29
Ruler: Venus
♉
Taurus 2nd Decan
Approximate dates: April 30 – May 10
Ruler: Mercury
♉
Taurus 3rd Decan
Approximate dates: May 11 – May 20
Ruler: Saturn
♊
Gemini 1st Decan
Approximate dates: May 21 – May 31
Ruler: Mercury
♊
Gemini 2nd Decan
Approximate dates: June 1 – June 10
Ruler: Venus
♊
Gemini 3rd Decan
Approximate dates: June 11 – June 20
Ruler: Uranus
♋
Cancer 1st Decan
Approximate dates: June 21 – July 1
Ruler: Moon
♋
Cancer 2nd Decan
Approximate dates: July 2 – July 12
Ruler: Pluto
♋
Cancer 3rd Decan
Approximate dates: July 13 – July 22
Ruler: Neptune
♌
Leo 1st Decan
Approximate dates: July 23 – August 1
Ruler: Sun
♌
Leo 2nd Decan
Approximate dates: August 2 – August 12
Ruler: Jupiter
♌
Leo 3rd Decan
Approximate dates: August 13 – August 22
Ruler: Mars
♍
Virgo 1st Decan
Approximate dates: August 23 – September 1
Ruler: Mercury
♍
Virgo 2nd Decan
Approximate dates: September 2 – September 11
Ruler: Saturn
♍
Virgo 3rd Decan
Approximate dates: September 12 – September 22
Ruler: Venus
♎
Libra 1st Decan
Approximate dates: September 23 – October 2
Ruler: Venus
♎
Libra 2nd Decan
Approximate dates: October 3 – October 12
Ruler: Uranus
♎
Libra 3rd Decan
Approximate dates: October 13 – October 22
Ruler: Mercury
♏
Scorpio 1st Decan
Approximate dates: October 23 – November 1
Ruler: Pluto
♏
Scorpio 2nd Decan
Approximate dates: November 2 – November 11
Ruler: Neptune
♏
Scorpio 3rd Decan
Approximate dates: November 12 – November 21
Ruler: Moon
♐
Sagittarius 1st Decan
Approximate dates: November 22 – December 1
Ruler: Jupiter
♐
Sagittarius 2nd Decan
Approximate dates: December 2 – December 11
Ruler: Mars
♐
Sagittarius 3rd Decan
Approximate dates: December 12 – December 21
Ruler: Sun
♑
Capricorn 1st Decan
Approximate dates: December 22 – December 31
Ruler: Saturn
♑
Capricorn 2nd Decan
Approximate dates: January 1 – January 10
Ruler: Venus
♑
Capricorn 3rd Decan
Approximate dates: January 11 – January 19
Ruler: Mercury
♒
Aquarius 1st Decan
Approximate dates: January 20 – January 29
Ruler: Uranus
♒
Aquarius 2nd Decan
Approximate dates: January 30 – February 8
Ruler: Mercury
♒
Aquarius 3rd Decan
Approximate dates: February 9 – February 18
Ruler: Venus
♓
Pisces 1st Decan
Approximate dates: February 19 – February 29
Ruler: Neptune
♓
Pisces 2nd Decan
Approximate dates: March 1 – March 10
Ruler: Moon
♓
Pisces 3rd Decan
Approximate dates: March 11 – March 20
Ruler: Pluto