Planetary Combustion Explained: When a Planet Sits Too Close to the Sun
Called Asta in Sanskrit, combustion describes what happens when a planet's light is traditionally considered "overpowered" by its proximity to the Sun.
Quick Answer
Planetary combustion, or Asta, occurs when a planet is positioned very close to the Sun in a birth chart — within a specific degree range that varies by planet. Traditionally, a combust planet is considered weakened, its significations less clearly expressed, since it sits too close to the Sun's dominating light.
In This Guide
What Is Combustion?
Combustion, called Asta in Sanskrit, describes a planet positioned so close to the Sun in a birth chart that classical texts consider its own light and significations "overpowered" or obscured by the Sun's dominating brightness.
How Close Is Too Close?
| Planet | Approximate Combustion Range |
|---|---|
| Moon | Within 12 degrees of the Sun |
| Mars | Within 17 degrees |
| Mercury | Within 14 degrees (12 if retrograde) |
| Jupiter | Within 11 degrees |
| Venus | Within 10 degrees (8 if retrograde) |
| Saturn | Within 15 degrees |
These ranges vary slightly across classical texts, but the underlying principle — closeness to the Sun weakening a planet's expression — is consistent.
Traditional Interpretation
A combust planet is traditionally read as having its significations expressed less clearly or confidently — not absent, but harder to access without conscious effort. The specific life area affected depends on which planet is combust and which house or theme it governs in that individual's chart.
Mercury and Venus, being closer to the Sun in their actual orbits, are combust far more frequently than outer planets like Jupiter or Saturn — which is why combustion is discussed especially often for these two planets.
Exceptions and Nuances
Some classical texts describe conditions under which combustion's weakening effect is considered reduced or cancelled — for instance, when the combust planet is otherwise very strongly placed. As with most chart factors, combustion is read in context, not as an automatic, unconditional weakening.
Summary: Key Takeaways
- Combustion (Asta) occurs when a planet sits very close to the Sun.
- Each planet has its own traditional combustion degree range.
- A combust planet is traditionally read as weakened, not absent, in its expression.
How PalmGuru Checks for Combustion
PalmGuru's deterministic astrology engine checks each planet's exact distance from the Sun in your chart to determine combustion status, and your AI Jyotishi can explain what it traditionally means.
This guide reflects traditional interpretations, provided for entertainment and self-reflection purposes only and not as medical, legal, financial, or psychological advice. See our Terms of Service.
Frequently Asked Questions
What is planetary combustion?
When a planet sits very close to the Sun in a birth chart, traditionally considered to weaken that planet's expression.
What is combustion called in Sanskrit?
Asta.
How close does a planet need to be to the Sun to be combust?
It varies by planet, roughly 10 to 17 degrees depending on which planet is involved.
Which planets are combust most often?
Mercury and Venus, since they orbit closest to the Sun and are frequently near it as seen from Earth.
Does combustion mean a planet has no effect?
No, it's traditionally read as weakened or less clearly expressed, not absent, and some conditions are believed to reduce the effect.
How does PalmGuru check for combustion?
PalmGuru's deterministic astrology engine checks each planet's exact distance from the Sun in your chart.
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