Combustion is an ancient astrological concept describing what happens when a planet gets too close to the Sun. Astronomically, the planet becomes invisible — lost in the Sun's glare. Astrologically, the planet's significations become hidden — not destroyed, but temporarily absorbed by the Sun's overwhelming energy.

Three zones define a planet's proximity to the Sun: Under the beams (within 17°) is a mild dimming. Combustion (within 8°30') is full invisibility — the planet is completely hidden. Cazimi (within 0°17') is the paradoxical moment at the very center of combustion where the planet is momentarily exalted rather than weakened — sitting "in the heart of the Sun."

The practical takeaway: during combustion periods, the themes ruled by that planet operate behind the scenes. Mercury combust? Communication is private. Venus combust? Love and beauty recalibrate internally. The cazimi at the center of each combustion period offers a brief window of extraordinary clarity — the eye of the storm.

✦ What Is Cazimi in Astrology?

Cazimi comes from the Arabic kaṣmīmī (قلب الشمس — "heart of the Sun"). It occurs when a planet is within 0°17' of exact conjunction with the Sun. Despite being at the deepest point of combustion, this moment is considered a flash of extraordinary power and clarity. Traditional astrologers used cazimi for timing elections (auspicious moments): signing contracts at Mercury cazimi, declaring love at Venus cazimi, making bold moves at Mars cazimi. Each planet's cazimi offers a unique quality of illumination.

Planetary Combustion FAQ

What does it mean when a planet is combust?▼

A planet is combust when it's so close to the Sun (within 8°30') that it becomes invisible in the sky. Astrologically, this means the planet's themes — communication for Mercury, love for Venus, etc. — become temporarily hidden or muted. It's not destruction; it's a private processing period.

What is cazimi and why is it special?▼

Cazimi (from the Arabic "in the heart of the Sun") occurs when a planet is within 0°17' of exact conjunction with the Sun. Despite being in the middle of combustion, this brief moment is considered one of extraordinary clarity and power — the Sun momentarily exalts rather than overwhelms the planet.

Is combustion the same as retrograde?▼

No. Retrograde is about a planet appearing to move backward (review and revision). Combustion is about a planet being too close to the Sun to be seen (hidden, private, muted). They can overlap — Mercury is often combust during retrograde at inferior conjunction — but they're distinct phenomena.

Which planets get combust?▼

All visible planets experience combustion. Mercury is combust most frequently (~3× per year) because of its close orbit to the Sun. Venus and Mars are combust less often but for longer periods. Jupiter and Saturn each experience combustion about once per year for 3-4 weeks.

How does combustion affect my birth chart?▼

If you were born with a combust planet in your natal chart, that planet's themes are processed internally rather than expressed outwardly. This is a lifelong pattern, distinct from transiting combustion periods. Many successful people have combust natal planets — the gift is depth and internal processing power.

What is "under the beams"?▼

"Under the beams" is a wider zone (within 17° of the Sun) where a planet's light is beginning to be dimmed but isn't fully hidden yet. It's a transitional state — weaker than normal visibility but not as intense as full combustion. Think of it as pre-combustion and post-combustion twilight.