Term Rulerships

A term ruler, or bound lord, governs a particular span of degrees inside a zodiac sign. The spans are unequal, and five planets—Mercury, Venus, Mars, Jupiter, and Saturn—share the thirty degrees of each sign. The Sun and Moon do not rule bounds.

This is a smaller jurisdiction than sign rulership. A planet may be in Jupiter's sign but in Mercury's bound, for example. Jupiter remains the domicile lord; Mercury describes the immediate degree-level authority. The distinction is why bounds belong to essential dignity without replacing domicile, exaltation, triplicity, or face.

Finding the ruler

First choose a term table. The Egyptian and Ptolemaic tables do not assign every degree to the same planet, so a reading is not reproducible unless the table is named. The Egyptian arrangement is common in later traditional practice; Ptolemy records and argues for another arrangement in Tetrabiblos. The repository also treats Egyptian terms and Ptolemaic terms separately.

Next, locate the planet's sign and exact zodiacal degree in that table. The planet assigned to the containing interval is the bound lord. A position at 12°47′ belongs to the interval that includes 12°47′; it should not be rounded to 13°. At a boundary, minutes and seconds can change the result.

What the bound lord contributes

Traditional authors do not treat the bound lord as a second version of the planet. It is better understood as a limited dispositor: the occupant acts in territory administered by another planet. If the occupant is in its own bound, it has a modest form of essential dignity. If another planet rules the bound, that ruler becomes part of the placement's chain of dependence.

The ruler's condition therefore matters. Check where it is placed, whether it is visible and direct, whether it is angular or cadent, and whether it has an aspectual relationship with the occupant. These factors describe how available the local ruler is; they do not rewrite the bound table. William Lilly's dignity tables give terms less weight than domicile or exaltation, which is a useful guard against making a degree-level ruler carry the whole delineation.

Vettius Valens also uses bound rulers in predictive procedures. In that setting a bound lord may become a period ruler when a significator is carried through successive degree ranges. That is a distinct use of the same table, developed on the term timing page.

A compact reading sequence

Suppose Venus is in a bound ruled by Saturn. Record three separate facts:

1. Venus supplies the significations being judged.
2. Venus's sign condition supplies the broader setting.
3. Saturn administers the local degree and must be inspected in its own right.

This does not automatically make Venus cold, delayed, unhappy, or disciplined. Those are possible interpretive directions, not facts supplied by the bound alone. A well-placed Saturn configured with Venus offers different testimony from a cadent Saturn that does not regard Venus. House topic, sect, reception, and other dignities still decide how much the relationship can deliver.

Where rulership stops

Term rulership is most useful when it answers a narrow question: who has authority over this degree, and what condition is that ruler in? It is not a standalone personality description, an event prediction, or proof of a benefic or malefic outcome. Two planets in the same sign can have different bound lords, but that difference should refine the larger chart judgment rather than compete with it.

For comparison between the occupant and its ruler, see Term Relationships. For weighing this dignity against other testimonies, see Term Strength.