Two small marks cause more worry in a birth chart than almost anything else: the R beside a planet that is retrograde, and the word combust beside a planet that is too close to the Sun. The kundali calculator shows them as the ℞ Retro and Combust badges in its planetary positions table, and between them they appear in about nine charts in ten: roughly seven people in ten have at least one retrograde planet, and two in three have at least one combust planet. Retrograde and combust planets are among the most misread features in popular astrology, usually described as weak, damaged or unlucky. In practice they describe how a planet delivers its results, the route, the pace and the kind of authority involved, far more than whether it delivers them. This page explains both conditions, gives the numbers for each planet, and leads to the eleven detailed articles that read each one; the planets themselves are introduced in the planets section.
Conventions used. Parashari astrology, whole-sign houses, the Lahiri ayanamsa and Vimshottari dasha, the Jagannatha Hora settings. The classical combustion orbs are used throughout: Moon 12 degrees, Mars 17, Mercury 14 (12 when retrograde), Jupiter 11, Venus 10 (8 when retrograde), Saturn 15. Some programs use slightly different orbs. Every frequency on this page was computed from the Swiss Ephemeris for the sixty years from 1950 to 2010. KP appears in one section, labelled as such.
Every retrograde or combust planet in your chart, read in context.
A consultation reads each retrograde and combust planet by its degree, sign, the houses it rules for your ascendant and the dasha periods ahead, so you know which of these marks matter in your chart and when.
In this article
- Two conditions with two different causes
- Which planets can be retrograde, and which can be combust
- Retrograde and combust planets by the numbers
- What a retrograde planet means
- What a combust planet means
- When a planet is both at once
- Reading either condition in five steps
- Common misreadings, and what charts actually show
- The ℞ Retro and Combust badges in the calculator
- How KP treats the same conditions
- Remedies, gemstones and the functional role
- Frequently asked questions
Two conditions with two different causes
The two marks are often mentioned together, but they come from quite different astronomy. A planet is retrograde, vakri in Sanskrit, when it appears from the Earth to move backward through the zodiac. Nothing actually reverses. The effect comes from the Earth overtaking an outer planet on the inside track, or an inner planet swinging round between the Earth and the Sun, and it always happens at a particular point in each planet’s cycle relative to the Sun.
A planet is combust, asta, when it is so close to the Sun in the sky that it is lost in the Sun’s light. Combustion is measured in degrees between the planet and the Sun, and each planet has its own classical orb. The two conditions therefore sit at opposite ends of an outer planet’s cycle: Mars, Jupiter and Saturn are combust when they lie beyond the Sun, and retrograde months later when they stand roughly opposite it. That is why a vakri graha and an asta graha are read differently, one as a question of pace and direction, the other as a question of independence from the Sun’s authority.
Which planets can be retrograde, and which can be combust
The Sun is the reference for combustion and is never retrograde, so it can be neither. The Moon never turns retrograde, but it becomes combust for about two days around every new moon. The five star planets, Mercury, Venus, Mars, Jupiter and Saturn, can each be retrograde and can each be combust. Rahu and Ketu, the lunar nodes, are a special case: in the mean-node calculation most software uses, they always move backward and are always shown as retrograde, so their retrograde mark is their normal state and is not read the way a planet’s is. They are never described as combust, though a node close to the Sun and Moon at a new or full moon produces an eclipse.
Only two planets can carry both marks at once. Mercury and Venus orbit inside the Earth’s orbit, turn retrograde when they pass between the Earth and the Sun, and are close to the Sun at exactly that moment. Mars, Jupiter and Saturn are retrograde only when they are far from the Sun, so for them the two conditions can never coincide, and a chart that shows both has an error in its birth data or its settings.
Retrograde and combust planets by the numbers
How common a condition is matters more than most readings admit. Anything that appears in a third of all charts cannot mean misfortune, and the figures below, computed day by day across sixty years of the ephemeris, are the best antidote to a frightening reading.
| Planet | Retrograde | Combustion orb | Combust | Both at once? |
|---|---|---|---|---|
| Saturn | 36 percent of days, spells of 133 to 142 days | 15 degrees | 9.2 percent of days | Never |
| Jupiter | About 30 percent, spells of 117 to 124 days | 11 degrees | 7.3 percent | Never |
| Mercury | 19.2 percent, spells of 19 to 25 days, about three a year | 14 degrees, 12 when retrograde | 41 percent | Often: six retrograde Mercurys in ten are combust |
| Mars | 9.4 percent, spells of 60 to 81 days every 26 months | 17 degrees | 15.4 percent | Never |
| Venus | 7.3 percent, spells of 41 to 43 days every 19 months | 10 degrees, 8 when retrograde | 15 percent | Sometimes: one retrograde Venus in four is combust |
| Moon | Never retrograde | 12 degrees | 6.6 percent, around each new moon | Not applicable |
Counted across whole charts, the picture is even more ordinary. About seven charts in ten hold at least one retrograde planet, and more than one in four hold two or more. About two in three hold at least one combust planet, mostly Mercury. Fewer than one chart in ten has neither mark anywhere.
What a retrograde planet means
Classical astrology gives a retrograde planet its full cheshta bala, the strength of motion, so a vakri graha is a strong planet rather than a weak one. What changes is the way it works. Retrograde planets tend to turn their significations inward, revisit what they have begun, deliver on a second attempt, and take a longer route to a result that then tends to last. Retrograde planets in birth chart readings are therefore questions of pace, direction and revision, and each planet shows it in its own way.
A retrograde Saturn, the most common of the five, describes responsibility carried inward and results that arrive after long effort. A retrograde Jupiter describes wisdom and faith worked out personally rather than received. A retrograde Mercury gives a mind that rereads and does its best thinking on the second pass. A retrograde Mars gives energy gathered before it is spent, a long fuse and a habit of winning the second contest. And a retrograde Venus, the rarest of the five, describes love and taste formed slowly and privately, and a tendency for people and passions to return.
What a combust planet means
The classical court of the planets is the clearest way into combustion. The Sun is the king; the Moon is the queen, Mars the commander, Mercury the prince, Jupiter and Venus the two ministers, and Saturn the servant. A combust planet is a member of the court standing at the king’s side. It keeps its abilities, but it works in the king’s name, so its results come through authority, a parent, an institution, an employer or the person’s own ambition, and it tends to gain its independence later, often in a particular dasha period. Combust planets in birth chart readings are therefore questions of independence and route rather than of loss.
Each member of the court shows this differently. A combust Mercury, the most common, is the prince learning at court, capable and credited through a superior. A combust Mars is the commander marching on the king’s orders, and it is also one of the most widely accepted cancellations of Mangal dosha. A combust Jupiter is the friendly minister whose counsel is issued in the king’s name, while a combust Venus is the rival minister, whose pleasures must answer to the king’s duties. A combust Saturn is the servant whose long labour builds the king’s house, and a combust Moon, born on Amavasya or Shukla Pratipada, is the queen whose feelings are drawn into the king’s purpose. Each planet’s pairing with the Sun is also read as a conjunction in the conjunction series, which grades the closeness in detail.
When a planet is both at once
Mercury and Venus are the only planets that can be retrograde and combust together, and the combination is much commoner for Mercury than for Venus. Six in ten retrograde Mercurys fall within the twelve-degree orb that applies to a retrograde Mercury, against about one in four retrograde Venuses within their eight-degree orb. The smaller orbs for the retrograde state follow from visibility: when Mercury or Venus passes between the Earth and the Sun it is near us and bright, so it emerges from the Sun’s glare at a smaller distance than it does from the far side of its orbit.
In reading, the two conditions combine rather than cancel. A retrograde and combust Mercury tends to describe a mind that forms its views privately and near a strong authority, and a retrograde and combust Venus feelings or creative work kept out of view until circumstances allow them to be declared. Both cases are covered in detail in the retrograde articles for those planets, since the retrograde motion is the rarer and more distinctive of the two marks.
Reading either condition in five steps
The first step is to confirm the condition from the degrees rather than the badge. Retrograde status comes from the planet’s daily motion at the moment of birth, and combustion from the distance between the planet and the Sun compared with the orb. Because programs differ slightly in their orbs, a planet near the edge may be marked combust by one and not by another, and because combustion is counted in degrees, a planet can be combust while sitting in the sign next to the Sun’s.
The second step is the planet’s sign and dignity, since an exalted, own-sign or debilitated planet carries either condition very differently, and debilitation brings in the rules of neecha bhanga. The third is the houses the planet rules for the ascendant, which decide whether it is a functional benefic whose gifts are being routed or delayed, or a functional malefic whose harm is being softened. The fourth is the house it occupies and the planets that aspect or join it. The fifth, and the one that settles the practical question, is the dasha: a retrograde or combust planet shows its results in its own periods and sub-periods, and in the periods of the planets connected to it, and nowhere else with any force.
Common misreadings, and what charts actually show
The commonest misreading is that a retrograde planet is weak. The classical texts say the opposite, and in charts a retrograde planet usually shows itself as persistent and deliberate. The second is that a combust planet is destroyed. What charts show far more often is a planet whose results arrive through an authority first and independently later, and for Mercury in particular, combust in two charts in five, a reading of damage would condemn a great many capable people.
Three further misreadings are worth naming. A popular rule of thumb says a retrograde planet in debilitation acts as if exalted, and the reverse; it is a later idea, not a classical rule, and it should be tested against the chart rather than assumed, as the retrograde Saturn article explains. Transit retrograde periods of Mercury, Venus and Mars are widely treated as dangerous, but a fast planet’s transit does not time events on its own; the dasha does. And the idea that every retrograde or combust planet needs a gemstone ignores the planet’s functional role, which is the first thing any sound remedy depends on. For anyone who has been frightened by a reading, reading a chart without fear is a good companion to this page.
The ℞ Retro and Combust badges in the calculator
In the calculator’s planetary positions table, the ℞ Retro badge marks any planet moving backward at the moment of birth, and the Combust badge marks any planet inside its combustion orb. The degree of every planet is shown alongside, so the distance from the Sun can always be checked by subtraction. Each badge now has an article behind it in this set, one for each planet that can carry it, and the articles give each planet’s numbers, dignity, lordships, dasha timing and worked examples.
The badges describe the birth moment only. They do not change with transits, and they say nothing about the dasha periods in which the planet’s results will arrive. A chart with three retrograde planets and a combust Mercury is not three times as difficult as a chart with none; it is a chart in which four planets need their route read carefully.
How KP treats the same conditions
KP, the Krishnamurti system, reads these conditions through significators rather than dignity. A retrograde planet acting as a significator, or as the sub-lord of a cusp, has long been debated as a sign of delay or denial of the matter concerned, and the arguments on both sides are set out in retrogression in KP: deny or delay. Combustion is treated as a modifier of strength rather than a denial, so a combust planet still signifies its houses, a position explained in combustion and eclipses in KP.
A related condition sometimes confused with combustion is planetary war, graha yuddha, when two of the star planets come within a degree of each other; it involves no Sun at all and has its own rules, covered in Graha Yuddha. In both systems the practical conclusion about retrograde and combust planets is the same: the condition shapes how a promise is delivered, and the house significations and the dasha decide whether and when it is.
Remedies, gemstones and the functional role
Most retrograde and combust planets need no remedy. Where one seems called for, the first question is always the planet’s functional role for the ascendant, since strengthening a planet that rules difficult houses can add to a problem rather than solve it, and the site’s guide to risk-based gemstone therapeutics sets out how that judgement is made. A retrograde planet already has full strength of motion, and a combust one is usually served better by practical steps than by strengthening.
The practical steps follow the readings. For a retrograde planet, they involve building in time for revision and second attempts rather than forcing first results. For a combust planet, they involve claiming independence at the right time: putting one’s own name to work, taking the step away from an overshadowing authority when the dasha supports it, and allowing the planet’s matters, whether speech, courage, counsel, pleasure, labour or feeling, some room that does not have to answer to the Sun.
Frequently asked questions
What does a retrograde planet mean in a birth chart?
A retrograde planet appeared to move backward at the moment of birth. It is strong rather than weak in classical terms, and it tends to work inwardly, revise, return and deliver on a second attempt. The retrograde planets meaning in any particular chart depends on the planet’s sign, the houses it rules and the dasha.
What does a combust planet mean?
A combust planet was so close to the Sun at birth that it was lost in the Sun’s light. It keeps its abilities but tends to deliver through an authority, a parent, an institution, an employer or the person’s own ambition, before it delivers independently. The exact distance, sign and lordships decide how much it matters.
What are vakri and asta grahas?
Vakri graha is the Sanskrit term for a retrograde planet and asta graha for a combust one. Vakri means crooked or turning, describing the backward loop, and asta means set, describing a planet hidden in the Sun’s light as a star sets below the horizon.
Can a planet be retrograde and combust at the same time?
Only Mercury and Venus. They turn retrograde while passing between the Earth and the Sun, close to the Sun, so the two conditions often coincide for Mercury and sometimes for Venus. Mars, Jupiter and Saturn are retrograde only when far from the Sun, so for them the answer to can a planet be retrograde and combust is always no.
Are the Sun, Moon, Rahu or Ketu ever retrograde?
The Sun and Moon never are. Rahu and Ketu always move backward in the mean-node calculation most software uses, so they are shown as retrograde as a matter of course, and that mark is not read the way it is for a planet.
Are retrograde or combust planets weak?
Not in the sense usually meant. A retrograde planet has full strength of motion, and a combust planet loses independence rather than ability. Both conditions are common, together appearing in about nine charts in ten, and both are read through the planet’s sign, lordships and dasha.
Do I need a remedy for a retrograde or combust planet?
Usually not. Any remedy should start from the planet’s functional role for your ascendant, and gemstones in particular should never be chosen from the retrograde or combust mark alone. Practical steps, time for revision with a retrograde planet and independence at the right moment with a combust one, help most.
Know which of your planets' marks actually matter.
A consultation reads every retrograde and combust planet in your chart by degree, dignity and lordship, and places each in the dasha periods ahead, so you know where to be patient, where to claim independence, and when.