Combustion (Ast) — Degrees by Planet

A planet is combust, Ast or Astangata in Sanskrit (literally body hidden), when it sits so close to the Sun in the sky that its light is lost in the solar glare. The Surya Siddhanta opens its chapter on rising and setting by describing exactly these planets: bodies overpowered by the rays of the Sun, with their light made small.^[1] Classical texts read this as a planet losing its independent voice -- its natural significations continue to operate, but filtered through the Sun’s dominance rather than expressed on their own terms. Combustion is a separate check from Shadbala and dignity, sitting alongside them in a full suitability analysis rather than being a sub-component of either, and it is one of the more commonly overlooked factors in casual gemstone advice that stops at Lagna alone. This page is one cluster of the Trikaal Vaani Vedic gemstone astrology guide, which explains how every factor below feeds into a final stone decision, and it sits beside our pages on Shadbala planetary strength and planetary dignity, exaltation and debilitation.

The Combustion Degrees for Each Planet

Six of the nine planets can become combust. The Sun cannot combust itself, and Rahu and Ketu, having no physical body, are exempt entirely. The orbs used in practice, measured as distance from the Sun, are commonly cited as:

• Moon: within 12 degrees
• Mars: within 17 degrees
• Mercury: within 14 degrees (12 degrees when retrograde)
• Jupiter: within 11 degrees
• Venus: within 10 degrees (8 degrees when retrograde)
• Saturn: within 15 degrees

The Mars, Jupiter, Saturn, Venus and Mercury figures come from the Surya Siddhanta, not from Brihat Parashara Hora Shastra or Phaladeepika as many websites repeat: Jupiter sets at 11, Saturn at 15 and Mars at 17 of these degrees,^[2] Venus at 8 on its large-disc retrograde side and 10 on its small-disc direct side,^[3] and Mercury at 12 when retrograde and 14 when moving fast.^[4] The Moon figure of 12 degrees is the customary working value, but we did not find a verse in the Trikaal library that states it, so treat it as tradition rather than a quoted rule. The often-repeated idea that Mars has a smaller retrograde orb is also not in the verse we read, so this page no longer lists it. The figures are widely but not perfectly consistent across secondary sources -- a few cite Mercury at 13 rather than 14 degrees, for instance -- so treat the exact boundary as approximate rather than laboratory-precise, the same caveat that applies to several other degree-based classical measurements. Notice that the two natural malefics among the six, Mars and Saturn, have the widest orbs (17 and 15 degrees), while the two naturally gentle planets closest to the Sun in real orbital terms, Mercury and Venus, have narrower orbs that tighten further still when either is retrograde -- a pattern commentators tie to Mars and Saturn’s already-forceful nature needing a wider berth before the Sun’s influence genuinely overwhelms them.

Surya Siddhanta on Combustion Degrees: What the Verse Actually Says

The Surya Siddhanta is the astronomy text that Indian panchang makers have used for centuries, and its ninth chapter is the real home of the combustion numbers. It gives each planet a count of asta-amsha, the setting degrees, and then states the rule in one line: with more of these time-degrees between planet and Sun the planet is visible, and with fewer it is not, because its body is seized by the light of the Sun.^[5] In plain words, combustion was first an observation question -- can you see the planet in the twilight sky or not -- and only later became a strength question in hora (birth chart) astrology. Keeping both meanings in mind stops two common mistakes: treating the orb as a magic wall where 11.9 degrees is a disaster and 12.1 is perfect, and forgetting that a combust planet is still physically there, still moving, still ruling its houses. Our planets in astrology guide explains what each graha rules, which is the part combustion never removes.

Kalamsha: Why the Classical Orb Is a Visibility Threshold

The verse calls these units kala-bhaga or kalamsha, time-degrees, which are measured along the rising arc of the sky rather than as a simple difference of zodiac longitude.^[5] That is why two careful software tools can disagree by a fraction of a degree about whether a planet is combust, and why, in Trikaal Vaani practice, the boundary is read as a band, not a knife edge. For gemstone and remedy decisions this matters a lot: a planet sitting at 13 degrees from the Sun with a 14-degree orb is technically Ast but very close to visibility, while one at 2 degrees is deeply inside the solar glare. Trikaal Vaani reads depth, not just the yes or no label, and the free Graha Bal calculator shows the actual distance from the Sun so you can see where in the band your planet sits.

Which Way a Planet Sets: East and West Combustion

The same chapter explains direction. Jupiter, Mars and Saturn, when the Sun overtakes them, set in the west and later rise in the east, and Venus and Mercury do the same when they are retrograde.^[6] The fast movers -- Moon, Mercury and Venus -- when they fall behind the Sun set in the east and when they move ahead of it rise again in the west.^[7] This is the classical root of the panchang phrases Guru Ast, Shukra Ast and Shukra Uday that families still check before fixing a wedding date. It also explains why Mercury and Venus keep entering and leaving combustion, which is the subject of the next section, and why our Venus transit 2026 page and Mercury retrograde 2026 page mention Ast periods alongside the sign changes.

Why Mercury and Venus Are Combust Most Often

Mercury and Venus orbit between Earth and the Sun and never appear far from it as seen from our vantage point -- Mercury stays within roughly 28 degrees of the Sun and Venus within roughly 47 -- which means these two planets pass in and out of combustion repeatedly and are, in practice, combust in a meaningfully larger share of birth charts than Mars, Jupiter or Saturn. The Moon, by contrast, is combust only briefly, for roughly two days around each new moon, since it orbits Earth rather than the Sun and moves through the full zodiac in about a month. Mars, Jupiter and Saturn, being genuinely farther from the Sun in orbital terms, spend comparatively little of each cycle close enough to combust, which is part of why combustion checks matter disproportionately for Mercury and Venus specifically when evaluating Panna and Heera. Before you buy either stone, run the Should I wear Panna check or the Should I wear Heera check, both of which look at combustion along with lordship.

What Combustion Actually Does

Classical texts frame combustion as something close to a contest the combust planet cannot win -- the Sun’s brightness overwhelms the weaker light of the combust planet, and its results become harder to see operating independently. This is not the same as destruction, however: a combust planet’s significations do not disappear, they simply express less visibly, more slowly, or more privately, and strong dignity in the same placement can preserve much of the planet’s underlying power despite the affliction. An exalted planet that also happens to be combust, for instance, is a genuinely different case from a debilitated planet that is also combust, even though both are technically Ast -- combustion dims whatever strength or weakness a planet already carries, rather than resetting it to some fixed neutral baseline. This is a genuinely separate concept from Graha Yuddha (planetary war), where two planets sit within one degree of each other and classical texts assess a winner and loser between them directly -- the Surya Siddhanta treats that meeting in its own chapter, where the loser is the one pushed to the south, covered, small and dim.^[8] Combustion specifically concerns a planet’s relationship to the Sun, not to any other planet.

Combust Planets in Parashara Avastha: Deepta, Kopi and Vikala

Parashara gives a list of nine avasthas, or planetary moods, and names them as Deepta, Swastha, Pramudita, Shanta, Deena, Duhkhita, Vikala, Khala and Kopa.^[9] A planet in its own exaltation sign is Deepta, which means shining.^[10] A planet joined with the Sun is called Kopi, which means angry or agitated, and a planet joined with malefics is Vikala, which means disabled.^[11] Phaladeepika uses a parallel list: exalted is Pradipta, and Shakta, the capable state, is reserved for a planet whose net of rays is clear,^[12] while a planet that has gone into setting is called Vikala.^[13] Phaladeepika then adds the result scale -- Pradipta gives full results, Vikala gives none, and the states in between give results in proportion.^[14] Parashara closes the topic by saying the result of each bhava should be judged from the state its planet was in at the moment of birth.^[15] So combustion in the birth chart is not a modern add-on, it is a named avastha with a result scale attached.

Exalted and Combust Together: Full Capacity, Not Visible

What happens when one planet is exalted, so Deepta, and also within the orb of the Sun, so Kopi or Vikala, at the same time? The two verses pull in opposite directions -- one calls the exalted planet shining,^[10] the other gives a setting planet no result^[14] -- so calling such a planet simply strong or simply weak would each be half wrong. The Trikaal Vaani reading, set by Rohiit Gupta as a standing house rule, is this: the capacity of an exalted combust planet is full, but it does not show outside. The person usually has the talent, the knowledge or the resource that the planet signifies, yet the visible result -- recognition, credit, a clean outcome -- arrives late, arrives under someone else’s name, or stays private. That is the most useful sentence a client can hear, because it says the gap is in visibility, not in ability. In practice this changes the advice: the work is to make the planet seen (its dasha timing, its house, a visible remedy), not to buy a bigger stone to add strength that is already there. Exalted Mercury in Virgo with the Sun close by, a very common placement, is the classic example, and our Budhaditya Yoga page shows how it plays out.

Budh-Aditya Yoga: When Combustion Is Not Entirely Bad News

Mercury close to the Sun is popularly called Budh-Aditya Yoga, and it carries a notably better reputation than combustion generally does -- this specific conjunction is often read as conferring intelligence, communication skill and analytical sharpness, treated in some readings as a minor Raja Yoga rather than a pure affliction. The library verse that supports this is in Jataka Parijata: Mercury whose rays are hidden by the Sun, yet in its own sign or Moolatrikona, makes a ruler learned in all subjects, and the text adds that this does not apply to the other planets.^[16] This is a genuinely useful exception to keep in mind: combustion is not a uniformly negative label applied identically to every planet, and Mercury’s particular relationship with the Sun is read more charitably than Mars, Saturn or Venus combustion typically are. Some modern astrologers go a step further and treat Mercury within about one degree of the Sun as especially lucky, calling it Mercury embraced by the Sun, but that idea comes from outside the Indian classics and we did not find it in any verse in our library, so do not rely on it. For the career side of this yoga read Ruchaka and Budhaditya Yoga for career.

Venus and Saturn: The Classical Combustion Exception

Two planets get special treatment. Uttara Kalamrita says that a combust planet, like one too young, too old or defeated, aspects without really aspecting, yet in the same verse it states that Venus and Saturn are strong even when combust.^[17] Laghu Jataka, in its longevity chapter, reduces the years given by a planet whose rays are lost in the Sun, and again exempts Saturn and Venus from that cut.^[18] So a combust Venus or Saturn should never be read with the same weight as a combust Jupiter or Mars. This is why the Trikaal Vaani suitability engine does not automatically mark Neelam or Heera as unsafe just because Saturn or Venus is Ast, and why the Should I wear Neelam check weighs lordship and dasha before combustion. If Saturn worries you for other reasons, our Saturn retrograde 2026 article covers the transit side.

Combustion and Yogas: When Raja Yoga Results Go Quiet

Parashara warns that planets which are combust, defeated in planetary war, debilitated or weak become breakers of the yogas they form.^[19] Jataka Parijata gives the same idea as a number: a planet in its own exaltation gives full result, while a debilitated, inimical or combust one gives only the result of an enemy sign.^[20] This is the reason a chart can show a textbook Raj Yoga or Gaj Kesari Yoga on paper and still deliver modestly. The limit is equally important: a yoga that is dimmed is not erased, and cancellation rules work the other way too, as our Neech Bhang Raj Yoga page explains. Before calling any yoga broken, check the depth of combustion, whether the planet is Venus or Saturn, and the dasha that is running -- three checks the Kundali strength calculator runs together.

Combust House Lord: What It Does to a Bhava

Phaladeepika gives the strongest classical statement on a combust house lord: if the lord of a house sits in the 8th, has its rays eclipsed by the Sun, is in a debilitated or enemy sign, and is neither joined nor aspected by benefics, that house suffers.^[21] Read the conditions carefully, because the verse needs all of them together, and the last one is an escape clause -- a single benefic joining or aspecting the lord changes the verdict. In plain language, the bhava (life area) whose lord is combust will need more effort and more patience, not that it is cancelled. Our houses in astrology guide lists what each bhava rules, so you can see which life area a combust lord touches, and the simple upay later on this page is meant exactly for such a lord.

Why Combustion Matters for Gemstone Selection

A functional benefic that is combust is a weaker recommendation than the same functional benefic uncombust, since its ability to deliver on its favourable house lordship is dimmed by the affliction -- this is one of the more common reasons a stone that looks favourable purely from Lagna analysis underperforms in an individual chart. Combustion does not change functional status itself, the same way dignity does not -- a combust functional malefic is still a functional malefic, and in some readings its already-difficult influence becomes harder to counteract precisely because it operates less visibly. Practically, this means combustion works in the opposite direction depending on functional role, mirroring how Shadbala and dignity behave: a combust functional benefic generally needs more caution before its gemstone is worn with full confidence, while a combust functional malefic does not become safer simply because its influence is dimmed -- a malefic operating quietly is not necessarily a malefic operating less. This is exactly the kind of chart-specific factor that a Lagna-only reading cannot see, and why Trikaal Vaani’s free Gemstone Suitability Calculator checks combustion alongside functional status, Shadbala and dignity rather than treating any single factor as sufficient on its own. Our functional benefic and malefic page explains the lordship half of that check, and why strong planets do not need gemstones explains the other half.

Common Misconceptions About Combustion

A combust planet is completely powerless -- not accurate. Combustion dims a planet’s independent expression, but strong dignity or other supporting factors can preserve much of its underlying strength, and the planet’s significations continue operating rather than vanishing. Every planet combusts at the same distance from the Sun -- no, each of the six combustible planets has its own specific orb, ranging from roughly 10 degrees for Venus to 17 for Mars, and Mercury and Venus additionally have tighter orbs when retrograde. Mercury combust is always a problem -- not necessarily. Budh-Aditya Yoga treats Mercury-Sun conjunction as a genuinely favourable combination in many readings, unlike combustion involving other planets. The Sun and the nodes can also become combust -- no, the Sun is the source of combustion rather than a subject of it, and Rahu and Ketu, being shadow points without physical bodies, are exempt from this affliction entirely. Combustion and retrograde motion are the same thing -- no, they are entirely separate conditions describing different aspects of a planet’s apparent motion and position, and a planet can be combust, retrograde, both, or neither, independently of each other.

Worked Example: A Favourable Stone Undercut by Combustion

Consider Jupiter for Pisces Lagna, discussed on our Pisces Lagna gemstone guide -- Jupiter is both Lagnesh and posited in its own sign there, making it the strongest possible functional-benefic case the system produces on paper. But if that same native’s actual Jupiter happens to sit within 11 degrees of the Sun, it is combust, and even this strongest-case planet’s practical delivery is dimmed by the affliction. This does not erase Jupiter’s favourable status -- a combust functional benefic is still a functional benefic -- but it is precisely the kind of chart-specific detail that separates a genuinely personalised suitability score from a Lagna-only recommendation that stops at house lordship alone. The same logic runs in reverse for a functional malefic: combustion dimming an already-difficult planet’s visible influence is not the same as neutralising the difficulty itself, which is why a full suitability check treats combustion as a modifier on existing functional status rather than a verdict of its own. Before wearing Pukhraj in such a chart, read who should wear Pukhraj and run the Should I wear Pukhraj check.

Combust Moon: Amavasya Birth and the Mind

The Moon is combust only around Amavasya, the new moon, when it rises and sets with the Sun. A birth in those two days gives a Moon with very little light, and since the Moon is the mind, the usual reading is a person who feels deeply but shows little, and who recharges best in solitude. The limit is clear: Moon combustion lasts a short window and is softened by benefic aspect, by a strong Lagna lord and by the Moon’s own sign. Our Amavasya significance page and Moon sign guide go deeper, and a Moti decision should only follow the Should I wear Moti check, never the combustion label alone.

Combust Mercury (Budh Ast) in the Birth Chart

Mercury is the planet most often found combust, so most people reading this have one. Mercury rules speech, trade, numbers and learning, and in the combust state these gifts are present but the person may doubt them, speak late in meetings or let others present their ideas. Because of the Jataka Parijata exception, a combust Mercury in Gemini or Virgo is read far more kindly than a combust Mercury in an enemy sign.^[16] Our Budh Mahadasha and career article shows how this changes during the Mercury period, and the Panna who should wear guide explains why a combust Mercury is not automatically a reason for Panna.

Combust Venus (Shukra Ast) and Marriage Timing

Venus is combust for several weeks around each conjunction with the Sun, and the panchang tradition avoids fixing a wedding muhurat while Shukra is Ast, a practice families still follow. In the birth chart, combust Venus is read as comfort, art and relationship gifts that are real but kept private or delayed. Remember the classical exception: Venus counts as strong even when combust,^[17] so the verdict is softer than for Jupiter or Mars. For marriage questions the Kundali Milan and marriage compatibility guide is the right next step, and for timing use the shubh muhurat calculator.

Combust Jupiter (Guru Ast) and Wisdom

Jupiter becomes combust for about a month each year. Guru Ast is the other muhurat restriction families watch, and in the birth chart a combust Jupiter is read as wisdom and good fortune that work quietly, through teachers or elders, rather than through the native standing at the front. Since Jupiter has no special exemption, its dasha is the period to plan around, and the free dasha calculator shows when it arrives. Our Jupiter transit 2026 page covers the yearly Guru Ast window in transit.

Combust Saturn and Combust Mars

Saturn is combust for about a month a year and Mars for a longer stretch because of its wide 17-degree orb.^[2] Combust Saturn keeps its endurance, since the classics call it strong even when combust,^[17] but the rewards of hard work can come through the father, the boss or the government rather than in the native’s own name -- the Sun is all three. Combust Mars shows courage and drive that are spent serving an authority rather than leading. Neither is a reason for fear. Read Moonga, who should wear it before any Mars stone, and the Should I wear Moonga check applies the combustion depth for you.

Combustion and Dasha Timing

A combust planet’s dimmed influence matters most in practice during that planet’s own Mahadasha or Antardasha, when its significations are already centre stage regardless of how visibly they express. A combust functional benefic running its own dasha period is a case where the combustion genuinely earns closer attention, since the native is living through that planet’s themes at exactly the time its independent voice is hardest to hear -- one more reason combustion is checked alongside Dasha context rather than in isolation, similar to how it is checked alongside Shadbala and dignity elsewhere in this series. Our Mahadasha explained page covers how the periods work.

Combust Planet Dasha: What Phaladeepika Says

Phaladeepika puts a number on it: in the dasha scale, a combust planet gives results like a debilitated one.^[22] That sounds heavy, so read the same chapter a little earlier, where it says the dasha of a planet in vargottama is good, but becomes mixed when that planet is set or debilitated -- mixed, not ruined.^[23] And it shows the opposite case clearly: exalted Venus in the 10th, 11th or 12th, free of combustion and not joined with malefics, gives great wealth in its years,^[24] which tells you that freedom from combustion is one of the conditions for full fruit, not that combustion cancels everything. The practical limit is the Venus and Saturn exception and the depth of the orb, and the practical upay is below. To see exactly when a combust planet’s period begins and ends, use the free dasha calculator or read how to find the weak planet in your kundli.

Combustion in Transit Versus the Birth Chart

Transit combustion is temporary -- Mercury may be combust for a couple of weeks, Jupiter for about a month -- and it mostly affects muhurat choices and short-term news connected to that planet. Natal combustion is permanent for the life of the chart and is what the avastha verses describe.^[15] Mixing the two is a common error: a news headline about Venus going Ast next month does not change a birth chart where Venus was clear. For live transit dates see our eclipse astrology 2026 page and the yearly transit pages, and for the natal check use the free Janam Kundali calculator.

Simple Upay for a Combust Planet

Combustion is a relationship with the Sun, so the first upay works on that relationship rather than on buying a stone.

1. What to do: offer a small lota of plain water to the rising Sun and say the name of your combust planet once in your mind.
2. When: every Sunday, within the first hour after sunrise.
3. Cost: free -- only water and a copper or steel lota you already have.
4. How many days: 11 Sundays in a row.
5. Why for you: your combust planet sits inside the light of the Sun in your own chart, so steadying your daily link with the Sun is the direct way to let that planet be seen.

A gemstone comes only after this, only if the planet is a functional benefic, and only after the Gemstone Suitability Calculator agrees -- the gemstone wearing rules guide explains the rest. For a planet-specific plan, the free upay calculator builds one from your chart.

Quick Reference: Checking Combustion Yourself

One question covers the basic check: how many degrees separate this planet from the Sun in your exact chart, and does that fall inside the orb listed above for this specific planet? A combustion calculator answers this instantly from your birth details rather than asking you to calculate angular separation by hand, and it automatically applies the tighter retrograde orbs for Mercury and Venus when relevant, a detail that is easy to miss in a manual check. The free weak planet finder also flags combust planets as part of its list.

Combustion in a Full Suitability Score

Trikaal Vaani’s free Gemstone Suitability Calculator treats combustion as one weighted input among several rather than a single deciding factor -- a combust functional benefic with otherwise excellent Shadbala and dignity can still score comfortably in the favourable range, while a combust functional benefic that is also weak on every other measure compounds into a genuinely borderline case. Reading any one factor in isolation, combustion included, risks either dismissing a stone too quickly or trusting it more than the fuller picture supports.

Why Combustion Alone Rarely Settles a Verdict

A combust planet’s status in the sky changes month to month for the fast-moving planets and much more slowly for Saturn, but the natal placement is fixed -- permanently combust or permanently clear -- because birth combustion, unlike a transiting one, does not change over a lifetime. This permanence is exactly why it deserves the same one-time, careful check as dignity, rather than being treated as a minor afterthought once functional status and Shadbala have already been reviewed. It is also why a Marana Karaka Sthana check and a Navamsa chart check sit next to it in a full reading.

The Takeaway

Combustion answers one specific question -- is this planet’s light overwhelmed by the Sun -- and like dignity, it always needs pairing with functional status to mean anything practical. A combust functional benefic loses confidence, a combust functional malefic does not gain safety, and an exalted combust planet keeps full capacity that simply is not visible yet.

Summary

Combustion dims a planet’s light, it does not erase its underlying power. Always check it alongside functional status, Shadbala and dignity, never in isolation, and the resulting picture will consistently be more accurate than any single-factor shortcut could genuinely ever hope to be entirely on its own.

Where to Go Next

For the strength question combustion feeds into, see our Shadbala page. For the sign-placement question that runs alongside it, see our Planetary Dignity page. For the functional question either always needs pairing with, see our Functional Benefic and Malefic page. For a reading by Rohiit Gupta that puts all of it together, see the Kundli reading by Rohiit Gupta. For the combined answer across all of these, use the calculator below.

A Closing Thought on Visibility Versus Absence

The most important reframe this page offers is that combust does not mean gone. Treating a combust planet’s stone as automatically worthless throws away a functional benefic that may simply need its case made more carefully, while treating combustion as harmless ignores a real, measurable dimming that a proper suitability check is built to weigh correctly, in exact combination with functional status, Shadbala and dignity, rather than round to zero or ignore entirely on its own.

Written by Rohiit Gupta, Chief Vedic Architect, Trikaal Vaani -- planetary distances from the Sun computed with Swiss Ephemeris (Lahiri ayanamsha). Rooted in Granth · Verified by Rohiit · Powered by AI.

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