Triplicity Rulers: The Day, Night and Participating Rulers of Each Element

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Traditional astrology gives every element a small team of ruling planets. The fire signs, the earth signs, the air signs and the water signs each have their own rulers, and a planet that stands in an element it rules is said to have triplicity, one of the five essential dignities. The word comes from the triangle the three signs of one element make around the zodiac.

What makes triplicity different from the better-known sign rulers is that it depends on whether the chart is a day chart or a night chart. Each element has a ruler that leads by day, a ruler that leads by night, and a third ruler that shares in both. This page gives the table, explains how day and night change the order, and works through three example charts. Its companion page, terms and bounds in astrology, covers the remaining dignity and uses the rulers here to check whether a planet is peregrine.

About the calculator. Triplicity is a traditional technique that Astrologist.com explains for education; it is not a feature of the site. The free birth chart prints each planet's sign, degree and minutes, which is all you need to look triplicity up yourself, but it does not label triplicity dignity, day or night charts, bounds or peregrine planets. The Astrologist chat is not a dignity calculator. The table below is an educational reference; the calculator scores nothing, and the dignity lookup on planetary dignities explained is unchanged. The figures on this page were worked out offline with the same calculation routines as the free chart.

What triplicity is, and what it is not

The twelve signs fall into four elements of three signs each, as set out on zodiac elements explained:

• Fire: Aries, Leo, Sagittarius
• Earth: Taurus, Virgo, Capricorn
• Air: Gemini, Libra, Aquarius
• Water: Cancer, Scorpio, Pisces

Triplicity rulership attaches planets to each of those groups. Because the rulers belong to the whole element, a planet's triplicity depends only on its sign: Saturn rules the air signs by day whether it is at 1° or 29° of Aquarius.

The same element groups are also used for the triplicity decans on decan rulers, which link the three thirds of a sign to the three signs of its element. That is a separate convention. Triplicity decans divide a sign into thirds; triplicity rulers name the planets that govern an element as a whole. This page is only about the second.

The three rulers of each element

This page uses the three-ruler table preserved in the Carmen Astrologicum of Dorotheus of Sidon, a first-century astrological poem. It is the page's working convention. Traditional authors did not all use the same table, and a later two-ruler version is shown further down.

Only the seven traditional bodies appear: the Sun, the Moon, Mercury, Venus, Mars, Jupiter and Saturn. Uranus, Neptune, Pluto, the Lunar Nodes and Chiron are not triplicity rulers and do not receive triplicity dignity.

A few patterns make the table easier to remember. The day rulers of fire and air are the Sun and Saturn, both counted among the planets of the day; the night rulers of earth and water are the Moon and Mars, both counted among the planets of the night. Venus leads two elements by day, earth and water. The Sun and Mercury appear only once each, the Sun as day ruler of fire and Mercury as night ruler of air; the other five planets appear twice.

How day and night set the order

The three rulers of an element are not equals. Which of the first two leads depends on the sect of the chart, that is, whether it is a day chart or a night chart:

• In a day chart, the day ruler leads, the night ruler comes second and the participating ruler third.
• In a night chart, the night ruler leads, the day ruler comes second and the participating ruler third.

The participating ruler is common to both and always stays third. Laid out for both kinds of chart:

This page calls the leading ruler for the chart's sect the active ruler of that element. How to tell a day chart from a night chart, using where the Sun sits relative to the chart's horizon, is explained on day and night charts. The free chart does not label sect, so you read it from the Sun's place in the wheel.

When does a planet have triplicity dignity?

A planet has triplicity dignity when it stands in an element it rules. On these pages the working rule is stricter than simply finding the planet anywhere in the element's row: for the dignity check, only the active ruler for the chart's sect counts. In a day chart that is the day ruler; in a night chart, the night ruler.

The other rulers are still shown in the table and are still part of the classical scheme. But a planet that is only the second ruler in its chart, or only the participating ruler, does not have triplicity dignity in the five-dignity check on the terms and bounds page, and that page explains what follows for peregrine planets. The reason for the stricter rule is that, in the later essential-dignity tradition that the peregrine test comes from, triplicity dignity was sect-dependent: in William Lilly's Christian Astrology (1647), for example, whether a planet has triplicity dignity depends on whether the chart is a day or a night chart.

Two cautions. First, triplicity sits alongside the other dignities rather than cancelling them: a planet can be in its fall and still be the active triplicity ruler of the sign it is in, and both facts stand. Second, none of this is a score. Astrologist.com does not add up dignity points, and a planet with triplicity is not called a strong planet.

Lilly's two-ruler table

In later tradition the three-ruler scheme was often simplified. Lilly's table of essential dignities gives each element one ruler by day and one by night, with no participating ruler:

For fire, earth and air this matches the first two columns of the Dorothean table. Water is the difference: Lilly gives it to Mars by day and by night, where the Dorothean table gives Venus by day and Mars by night.

That difference changes a result in one of the example charts below. Ruben has Mars in Cancer in a day chart. Under the page's Dorothean convention the active ruler of water by day is Venus, so Ruben's Mars has no triplicity dignity; under Lilly's table Mars rules water by day too, so it would. Neither result says anything about Ruben. They are two conventions applied to the same position, which is why this page states its convention rather than mixing tables.

How to look it up in your own chart

1. Note each traditional planet's sign. Open your free birth chart and read the Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn from the table under the wheel.
2. Find the element of each sign from the list above.
3. Decide day or night. With a known birth time, check whether the Sun is above or below the horizon, as described on day and night charts. If the Sun is close to the horizon, test your time range before choosing.
4. Read the order for your chart's sect from the second table.
5. Mark the planet's role. Is it the active ruler of its own element, the second ruler, the participating ruler, or none of them?
6. Check the sign edge. Triplicity depends only on the sign, so the degree matters only near 0° or 30°. If the free chart shows a planet within about 1′ of a sign change, treat its element as boundary-sensitive, because the printed minutes are cut from a position the calculator rounds to a hundredth of a degree.

Worked lookups

The three charts below are the site's fixed fictional example charts, recalculated with the routines behind the free chart. Ruben's and Noor's sect verdicts are the ones given on the day and night charts page.

Ruben: London, 5 January 1993, 12:00 GMT. A day chart (Sun in the 10th house, well above the horizon).

Two of Ruben's planets, Venus and Saturn, are the active rulers of their elements. Mars and Jupiter are rulers of their elements too, but not the active ones in a day chart, so on this page's rule neither has triplicity dignity. The R beside Mars marks it as retrograde, which does not change any of this.

Noor: Amsterdam, 2 December 1992, 21:30 CET. A night chart (Sun in the 5th house, below the horizon).

Noor's chart shows the night order at work. Her Sun, Venus and Saturn each sit in an element they rule by day, and in a day chart all three would be active rulers. In her night chart they come second, and only Mars, the night ruler of water, is active. Her Mars is also in its fall in Cancer; the fall and the triplicity are both true at once.

Lotte: Utrecht, 27 August 1991, 06:55 CEST. A day chart, only just. The day and night charts page shows that Lotte's Sun crossed above the chart horizon at 06:48; at 06:47 and earlier her chart is a night chart. That matters here.

Lotte's Sun, Mercury and Venus are in Virgo or Leo and are not rulers of their elements under either order. At her recorded 06:55, Saturn is the active ruler of air and Jupiter is second in fire. Eight minutes earlier the two swap: Jupiter becomes the active ruler of fire and Saturn steps back to second in air. Membership of the elements is the same either way; what changes is which ruler leads. If Lotte's birth time is reliable to within a few minutes, hers is a day chart. If it could be ten minutes early, which of the two has triplicity dignity cannot be settled.

When the birth time is unknown

Two separate questions arise without a birth time.

Which element is each planet in? That depends only on the sign, so the question is whether each planet stays in one sign across the whole birth date. That has to be checked, not assumed. On Ruben's date, a run of the calculation at every minute of the day shows the Sun, Mercury, Venus, Mars, Jupiter and Saturn each staying in one sign all day. The Moon does not: it moves from Taurus into Gemini at about 01:42, so without a time its element is unresolved for that date.

Which ruler leads? That needs sect, and sect needs the time. On Ruben's date in London the Sun is above the chart horizon from 08:13 to 16:00 local time. A birth window that stays inside those times, or entirely outside them, settles the order; a window that crosses either time leaves it unresolved, and so does a fully unknown time. In that case you can still say which element each planet is in and which three planets rule it, but not which of the first two leads.

The free chart's noon reference for an unknown time is a reference position, not a birth time, and it is not used to decide sect. A birth chart without a birth time explains what can still be read.

How triplicity was used and read

In Hellenistic astrology the triplicity rulers had uses well beyond the dignity of a single planet; Dorotheus, for example, used the triplicity rulers of the sect light when judging the general course of a life. Those techniques are outside this page. In the later essential-dignity tradition triplicity became one of five dignities, usually listed after domicile and exaltation. The twelfth-century author Abraham ibn Ezra compared a planet in its own triplicity to a person staying with relatives: not in their own house, but not among strangers either.

These are historical descriptions of a technical condition. A planet with triplicity dignity does not make anyone talented, fortunate or successful, and a planet without it does not mark anything lacking. Modern astrologers vary widely in whether they use triplicity at all.

Check your own chart

Open your free birth chart, note the seven traditional planets and their signs, settle day or night, and read off the rulers. Then take the result to terms and bounds in astrology to complete the five-dignity check. The methodology page sets out how positions are calculated, and you can ask the Astrologist about a placement, bringing the element and ruler you found.

Related articles

• Terms and Bounds in Astrology
• Planetary Dignities Explained
• Day and Night Charts
• Domicile and Detriment in Astrology
• Exaltation and Fall in Astrology
• Zodiac Elements Explained
• Decan Rulers for All 12 Signs