Reference · Astrology
What is a sextile?
Kevin Blaxton — software builder; astrology student for 40+ years · figures computed by the OrbHeaven engine
Published · Last revised
A sextile is the aspect of 60°: two planets a sixth of the circle apart, two signs away from each other. Those two signs are usually of compatible elements — fire with air, or earth with water — and the tradition reads the sextile as an opportunity, softer and milder than a trine.
What is a sextile?
Geometrically it is an aspect of 60° — two planets a sixth of the circle apart in ecliptic longitude. Two signs separate them, typically of compatible elements (fire–air or earth–water), which is the structural reason a sextile is felt as an easy but mild connection.
How it is counted: the orb
An exact sextile is 60°. OrbHeaven counts one within 5° of that in a birth chart, or 6° when the Sun or Moon is involved — a tighter orb than the four larger aspects, in line with common practice, because a sextile is held to act less strongly. The figure shows the 60° angle and that margin.
What it is read as
Interpretation, labelled as such: the sextile is classed as a “soft” aspect and read as an opportunity — a potential ease between the two planets that tends to need a little action to show itself, rather than flowing on its own as a trine is said to.
A short history
The sextile is a classical Ptolemaic configuration, derived from dividing the circle in six. It was counted as a minor harmonious aspect from antiquity — real but weaker than the trine — which is why it has long been given a smaller orb.
Common misconceptions
- Why does the sextile get a smaller orb than the trine?
- It is held to act less strongly, so the tradition — and OrbHeaven — allow less room: 5° rather than 7°. The weaker the aspect is considered, the tighter the orb.
- Is a sextile the same as a trine?
- Both are “soft”, but a sextile (60°) is milder and often described as an opportunity that needs acting on, where a trine (120°) is described as an ease that flows on its own.
References & further reading
- [1] Ptolemy, Tetrabiblos (2nd c. CE) — the sextile among the classical configurations.
- [2] Tompkins, S., Aspects in Astrology — the modern interpretation of the sextile.
- [3] OrbHeaven engine (astronomy-engine), aspects module — the 60° angle and the 5°/6° natal orb; re-derived in aspects-demo.test.ts.
Suggested citation
Blaxton, K. (2026). What is a sextile. OrbHeaven Reference. https://orbheaven.com/reference/the-sextileRevision history
- First build (concise). Shared aspect-shape diagram (60°, engine orb — note the tighter margin); links up to the Aspects hub, Orbs and The Four Elements. Geometry, orb computation, tradition and history kept separate. No interactive.
About a minute. Birth time optional, and no account until after you have seen it.
More in the reference library
What is an aspect in astrology? The angles, the orbs, and the geometry
An aspect is the angle between two points in a chart. This is the geometry — the six angles astrologers use, what an orb is, and where the set comes from — with an interactive dial that classifies any separation using OrbHeaven’s engine.
What is an orb in astrology?
An orb is how far an aspect is from exact — and how far from exact still counts. This explains the arithmetic, OrbHeaven’s orb table and the luminary rule, with an interactive dial, and that orbs are a convention of practice, not a scientific threshold.
What are the four elements in astrology?
Fire, earth, air and water are a traditional way of sorting the twelve signs into four groups of three — a classification of temperament, not a physical property of the signs. This explains the groupings, their classical qualities, where the scheme came from, and why it is not the chemistry of the same name.