Decan 1 of Virgo

This is the first ten-degree segment of Virgo, the mutable earth sign, spanning 0 to 10 degrees. Its ruler in the Chaldean order of faces is the Sun, reached by continuing the planetary sequence around the thirty-six decans. The decans are the oldest stratum of the tradition, beginning as thirty-six Egyptian star groups whose successive risings served as a calendar and a night-clock, absorbed into the Greek zodiac as ten-degree subdivisions of the signs only later.

The Golden Dawn, from 1888, mapped the numbered minor cards onto the decans in order; this segment carries the Eight of Coins, to which they gave the title Prudence, its Sun-in-Virgo attribution taken from the face ruler, the eights of the earthy suit and the diligent Virgin sign matching the card's theme of careful craftsmanship. That tarot layer is a modern Western overlay on the ancient decan scheme, not a feature of the Egyptian or Hellenistic material it was laid upon.

The first decan of Virgo runs from 0 to 10 degrees of the sign and is ruled, in the scheme this atlas records, by Sun.

The card on the decan

In the Golden Dawn's assignment this decan carries the Eight of Coins. The mapping is one to one and exhaustive: the thirty-six small cards numbered two to ten across the four suits match the thirty-six decans exactly, taken in order from the Two of Wands at the first decan of Aries. The suit follows the sign's element, so Virgo is a Earth sign and takes a card of Coins, and the rank follows the position in the sequence, which puts the eight here.

Two ruler schemes, and which one this is

Two schemes for decan rulership are in circulation and they disagree. The one recorded here runs the seven planets in Chaldean order continuously round the circle. The other, the triplicity scheme, gives a sign's three decans to the rulers of the three signs of its own element in order, so the rulers stay inside the element and restart at every sign. Both are attested in the tradition, neither is a corruption of the other, and a reader comparing two books will find them differing here without either being wrong.

What the atlas is recording

The degrees and the ruler are the attributions this atlas holds for this decan, and the card is the Golden Dawn's. All of them are traditions with variants rather than settled facts, and the decan itself, as a ten degree segment of a sign, is the only part that is simply arithmetic.