Two of the most dramatic conditions in a chart have nothing to do with where a planet is — only with where it stands in relation to others. Combustion happens when a planet hugs the Sun; planetary war happens when two planets stand within a degree of each other.
Both are about proximity, and both change a planet's power. They are rare enough to feel exotic and common enough that you will meet them in real charts.
Combustion: Too Close to the Sun
A planet is combust when it sits within a few degrees of the Sun — close enough that its light is overwhelmed. The classical limits vary by text, but a common scheme gives the Moon 12 degrees, Mercury 14, Venus 10, Mars 17, Jupiter 11, and Saturn 15. A combust planet loses the power to deliver its results clearly: its significations are obscured, delayed, or expressed with difficulty. The Sun itself is never combust.
Why the Limits Differ
The limits are not arbitrary — they follow the planets' real distances from the Sun. Mercury and Venus, the two inner planets, spend their lives near the Sun and have the largest tolerable spheres, because closeness to the Sun is their natural condition.
The outer classical planets are further away and are judged more harshly for approaching it. The Moon, quick and sensitive, is especially vulnerable: twelve degrees is close enough for its light to be swallowed entirely. The scheme is the tradition's way of asking the same question a physicist would: how far is too close, given what this body can withstand?
What Combustion Does
Think of the Sun as the light of consciousness and the self; anything standing in its glare gets washed out. A combust Moon finds its emotions ruled by something larger than itself; a combust Jupiter struggles to see its own wisdom.
In the classical view, combustion weakens a planet's ability to act independently — but not its existence. Its themes still appear in the chart, often through other planets and through the houses it rules.
Combustion Is Not Destruction
A combust planet is still the same planet. A combust Venus still loves and attracts, but its affections may be ruled by another's light — the partner, the father figure, the public — rather than by its own preference. A combust Mercury still thinks, but it thinks in the service of something brighter than itself.
The classical authors describe the combust planet as a king's minister: powerful, but acting in the king's shadow. Its results come through others, and they often arrive after the period of combustion passes — the planet's dasha years are when its voice, though shaded, finally speaks.
Benefics and Malefics in the Sun's Fire
Combustion moderates as well as weakens. A combust benefic — Jupiter, Venus, or Mercury — loses some of its protective shine: blessings arrive late or through others rather than directly. A combust malefic — Mars or Saturn — loses some of its harshness: the fire is banked by the Sun's light.
Combustion is a dimmer, not a switch. It turns the planet down, whichever side of benefic or malefic it stands on — which is why the same condition reads differently for a fortune-bringer than for a taskmaster.
The Moon's Combustion: A Special Case
The Moon's combustion is simply the new moon — the Moon within twelve degrees of the Sun — and its opposite, the full moon, is the Moon at its brightest and most exposed.
A new-moon birth is literally a combust Moon: the emotional life starts fresh and private, and its themes are lived from the inside out for the first decade or more. The classical texts treat the new-moon Moon as a soul beginning its cycle — vulnerable, but with the whole month ahead of it.
Planetary War: Two Planets, One Victory
When two planets come within one degree of each other, the texts describe a battle: the planet with the greater longitude — the one further along in the zodiac — wins the war, and the loser is weakened. A combust planet cannot wage war, and the Sun and Moon never fight each other.
The winner takes a boost in strength and prominence; the loser gives up some of its own. Retrograde planets can take part like anyone else, because war is decided by position, not motion.
The classical texts add one famous refinement: the closer the battle, the more the winner's victory matters. Two planets inside half a degree are not merely warring — they are fused, and the winner rules both themes for as long as they remain joined.
What It Means for You
Both conditions are modifiers, not verdicts. A combust Jupiter is still the planet of fortune — it just delivers its blessings late or through effort. A victorious Mars is a Mars that acts with unusual force.
The strongest clues come from timing: the effects of a combust or defeated planet tend to surface during its dasha periods, colored by the condition that marked it at birth.
How to Find This in Your Chart
- Check the longitude column in your report.
- For each planet, count the degrees to the Sun: within the limits above, the planet is combust.
- For war, look for any two planets within one degree of each other — the one with the higher longitude wins.
- Note which condition applies and reread that planet's house, the arena, with the modifier in mind.
You now know more about that planet's actual power than most casual readings will tell you.