Decan
Sign First Decan ruler ( 0 - 9.999 deg . ) Second Decan ruler ( 10 - 19.999 deg . ) Third Decan ruler ( 20 - 29.999 deg . )
Aries Mars Sun Venus
Taurus Mercury Moon Saturn
Gemini Jupiter Mars Sun
Cancer Venus Mercury Moon
Leo Saturn Jupiter Mars
Virgo Sun Venus Mercury
Libra Moon Saturn Jupiter
Scorpio Mars Sun Venus
Sagittarius Mercury Moon Saturn
Capricorn Jupiter Mars Sun
Aquarius Venus Mercury Moon
Pisces Saturn Jupiter Mars
Table of faces ( or decanates )
There were two main versions of rulership given to the decans in the ancient world : Chaldean rulership and rulership by Triplicity .
The decans (/ˈdɛkənz/; Egyptian baktiu) are 36 groups of stars (small constellations) used in the Ancient Egyptian astronomy. They rose consecutively on the horizon throughout each earth rotation. The rising of each decan marked the beginning of a new decanal hour (Greek hōra) of the night for the ancient Egyptians, and they were used as a sidereal star clock beginning by at least the 9th or 10th Dynasty (c. 2100 BCE). Because a new decan also appears heliacally every ten days (that is, every ten days, a new decanic star group reappears in the eastern sky at dawn right before the Sun rises, after a period of being obscured by the Sun's light), the ancient Greeks called them dekanoi (δεκανοί; pl. of δεκανός dekanos) or tenths. Decans continued to be used throughout the Renaissance in astrology and in magic, but modern astrologers almost entirely ignore them. [citation needed]