Quick answer: How close a planet sits to the Sun changes its strength. Within about 8.5 degrees it is combust and weakened, lost in the glare; within about 15 degrees it is under the beams, mildly dimmed; but within about 17 minutes of the exact Sun it is cazimi, in the heart of the Sun, and powerfully strengthened.
The Sun is the brightest body in the sky, and in traditional astrology its brilliance has consequences for any planet that draws near. A planet close to the Sun can be overwhelmed by its light, the way a star vanishes from view at dawn, or it can be lifted to a place of unusual honour. Which of these happens depends almost entirely on one thing: distance. Traditional practice marks out three zones around the Sun, and a planet that wanders into them is read very differently depending on exactly how close it gets. Understanding these zones is one of the oldest refinements in chart reading, and it changes how the whole symbolic story of a planet is told.
Measured by Longitude, Not Declination
Before the three zones make sense, one technical point matters. Traditional astrology reads a planet's relationship to the Sun by closeness in zodiacal longitude, meaning degrees measured along the band of the zodiac, not by declination or any other coordinate. So when an astrologer says a planet is within a certain number of degrees of the Sun, they mean degrees along the ecliptic, the same scale used to place planets in signs.
This keeps the rule simple and consistent with the rest of chart reading. You look at where the planet sits in the zodiac, you look at where the Sun sits, and you measure the arc between them. That single number, the longitudinal distance, decides everything that follows. It is also worth saying at the outset that the whole technique applies to planets other than the Sun. The Sun cannot be combust or cazimi to itself; these are descriptions of how every other planet stands in relation to it.
The Three Zones Around the Sun
There are three named conditions, and they nest inside one another like rings around the Sun. From the outermost to the innermost they move from mildly weakening, to strongly weakening, to suddenly and powerfully strengthening. The surprise of the system is that the weakest and the strongest places are almost on top of each other.
Under the Beams
The widest ring is called being under the beams, or under the sunbeams. A planet within about 15 degrees of the Sun, but outside the tighter zone of combustion, is under the beams. This is the gentlest of the three conditions. The planet is partly hidden in the Sun's light, dimmed but not destroyed. Its significations are softened and a little obscured, as if it were speaking from behind a bright curtain. An astrologer reading a planet under the beams treats it as somewhat veiled, present in the chart but not at full clarity, its themes muted rather than overwhelmed.
Combust
Move closer and the weakening sharpens. A planet within about 8.5 degrees of the Sun is combust, a word that comes from the idea of being burned up. Here the planet is not merely dimmed but overwhelmed, its meaning obscured by the sheer force of the Sun's glare. The classic image is a star lost in the Sun's light, invisible because it is simply too close to the source of brightness to be seen at all. In symbolic reading, a combust planet struggles to express itself cleanly. Its themes can feel consumed, hidden or hard to access, as though the matters it governs are caught up in something larger and brighter than themselves. Of the three conditions, combustion is the one traditionally read as the most weakening.
Cazimi
Now comes the reversal that gives this whole subject its fascination. Keep moving toward the Sun, past the burning of combustion, and at the very centre something extraordinary happens. A planet within about 17 minutes of arc of the exact degree of the Sun, which is to say about a quarter of a degree, is cazimi, a word that means in the heart of the Sun. Far from being weakened, a cazimi planet is enormously strengthened and dignified. The traditional image is vivid and tells you everything: where the merely combust planet is a subject burned at the edge of the king's blazing presence, the cazimi planet is a guest seated beside the king on his throne. It is not scorched by the Sun's power; it shares in it.
So the geometry holds a beautiful paradox. Just outside the exact conjunction lies the weakest place a planet can occupy, the heart of combustion. But right at the conjunction, within that tiny window of about a quarter degree, lies the strongest. Distance from the Sun matters a great deal, and a difference of only a few degrees turns a planet from burned to crowned.
Why Distance Tells the Story
It is worth holding these numbers together so the structure is clear. Outside about 15 degrees, a planet stands free of the Sun and is read on its own terms. Between roughly 15 and 8.5 degrees it is under the beams, mildly dimmed. Within about 8.5 degrees it is combust, strongly weakened and lost in the glare. And then, only within about 17 minutes of the Sun's exact degree, it is cazimi and powerfully strengthened.
The pattern is one of increasing intensity that suddenly flips. As a planet approaches the Sun it loses strength, and it keeps losing strength right up until the final fraction of a degree, where the relationship inverts and the planet is exalted instead. This is why a careful astrologer never reads a conjunction with the Sun as a single flat event. The exact arc between the two bodies decides whether the planet is being buried or being honoured.
How to Read These Conditions in a Birth Chart
In practice, these are conditions you check whenever a planet sits near the Sun in a natal chart. The first step is simply to measure the longitudinal distance and see which zone, if any, the planet falls into. A planet several signs away from the Sun is untouched by any of this. A planet a few degrees away is in one of the weakening zones. A planet sitting almost exactly on the Sun deserves a careful look to see whether it has crossed into cazimi.
Because the cazimi window is so narrow, only about a quarter of a degree, it is genuinely rare, and that rarity is part of why it is prized. When it does occur it deserves real attention, because it lifts a planet to one of the most dignified positions available in the symbolic language of the chart. The weakening conditions are far more common, and they ask you to soften your reading of the affected planet rather than abandon it.
Throughout, the spirit of the technique stays symbolic. Combustion, under the beams and cazimi describe how clearly a planet can express its meaning given its nearness to the Sun, not fixed verdicts about a life. To see whether any planet in your own chart falls into these zones, you can cast a free birth chart and look at where each planet sits relative to the Sun in longitude.
Frequently Asked Questions
Is combust always a bad thing?
Combustion is read as a weakening condition, the strongest of the three, because the planet's meaning is obscured and overwhelmed by the Sun's glare, like a star lost in the light. But this is symbolic language about clarity of expression, not a deterministic judgement. A combust planet is read with more care and a softer hand, taking into account everything else in the chart rather than being dismissed.
How is cazimi different from being combust?
The difference is pure distance. A planet within about 8.5 degrees of the Sun, but not at its exact degree, is combust and weakened. A planet within about 17 minutes of arc of the exact Sun, roughly a quarter degree, is cazimi and strongly strengthened. The same closeness that burns a planet at a few degrees crowns it at the very centre, which is why measuring the exact arc matters so much.
Does this apply to the Sun itself?
No. These conditions describe how a planet stands in relation to the Sun, so they apply to planets other than the Sun. The Sun cannot be combust, under the beams or cazimi to itself; it is the reference point against which every other planet is measured.
A Compact, Ancient Refinement
The three zones around the Sun are a small piece of traditional craft that repays attention out of all proportion to their size. They take a single measurement, the longitudinal distance between a planet and the Sun, and turn it into a graded reading: mildly dimmed under the beams, strongly weakened when combust, and gloriously strengthened when cazimi in the heart of the Sun. The lesson is that nearness to the Sun is never neutral, and that the last fraction of a degree can change a planet's whole standing. For more pieces on the symbolic language of the chart, browse the blog, and when you are ready to look at your own planets, cast your free birth chart and measure each one against the Sun.