The Third Decan of Pisces

This is the third ten-degree segment of Pisces, the mutable water sign, spanning 20 to 30 degrees, and the last of the thirty-six decans, closing the zodiacal circle. Its ruler in the Chaldean order of faces is Mars; because thirty-six is not a multiple of seven, the sequence of the seven planets, run five times around the wheel from Mars at zero Aries, closes exactly here at the end of Pisces, an elegance that helped fix the scheme. The decan is the oldest layer of astrology, the thirty-six having begun as Egyptian star groups used to divide the year and the night.

The Golden Dawn, from 1888, mapped the numbered minor cards onto the decans; this final segment carries the Ten of Cups, titled Satiety or Perfected Success, its Mars-in-Pisces attribution taken from the face ruler, the tens completing the water suit with the card of fulfilled emotional happiness. That tarot layer is a modern Western overlay on the ancient decan scheme rather than part of the inherited tradition.