Quick answer: The sextile is a classical Ptolemaic aspect of 60 degrees, one-sixth of the zodiac circle. It joins signs of the same polarity but different, compatible elements (fire with air, earth with water). Traditionally a lesser benefic, it is harmonious and flowing, weaker than the trine, and it describes supportive potential rather than a guaranteed event.
Among the configurations that give a birth chart its texture, the sextile carries a gentle reputation as the aspect of opportunity. Reading it well means separating what the classical tradition actually holds from the modern gloss that later grew around it.
What a sextile is: 60 degrees and its Ptolemaic pedigree
A sextile forms when two points in a chart sit 60 degrees apart, exactly one-sixth of the 360-degree zodiac and a span of two whole signs. Ptolemy, in the first book of the Tetrabiblos, counts it among the configurations of "regard" alongside the square (90 degrees), the trine (120 degrees), and the opposition (180 degrees). The conjunction (0 degrees) is added by later convention as a bodily union rather than a true aspect of beholding. The tradition sorts these into agreeing and disagreeing forms, and the sextile falls among the harmonious, sharing that rank with the trine. Its glyph is the six-rayed asterisk, and the aspect answers to dividing the circle by six. For a wider map of how these angles interlock, see our guide to astrology aspects.
Same polarity, different element
Because 60 degrees spans two signs, sextile signs always share the same polarity, both positive (masculine) or both negative (feminine), while belonging to different elements that nonetheless cooperate: fire signs sextile air signs, and earth signs sextile water signs. Aries sextiles Gemini and Aquarius, both air; Taurus sextiles Cancer and Pisces, both water; Leo sextiles Gemini and Libra. This is why the sextile reads as compatible but not identical. The two signs agree in gender and get along easily, yet they do not share a whole element the way trine signs do, so the bond is real but lighter.
Trine versus sextile: the lesser benefic and the modern reframe
Classically the sextile is a lesser benefic: genuinely favorable, but weaker than the trine. The reason is structural. Trine signs share an entire triplicity, the same element, while sextile signs agree only in polarity. That single step of separation is the whole difference in strength. Its actual quality still depends on the planets involved, since a sextile between two malefics flows easily in form without necessarily being pleasant in result.
The familiar idea that a trine is effortless (even lazy) ease while a sextile is an "opportunity" of latent talent you must consciously activate is a twentieth-century psychological reading, associated with humanistic astrologers such as Rudhyar, rather than classical doctrine. It is a useful lens, provided you treat it as a modern layer. Both aspects describe a supportive relationship in the chart; neither schedules an outcome.
Measuring a sextile: moiety orbs versus the modern orb
Here the classical and modern methods genuinely differ. In the traditional system the orb belongs to the planet, not to the aspect. Each planet carries an orb, and half of it, the moiety, combines with the other planet's moiety to set how wide any aspect between them may stretch. William Lilly's Christian Astrology (1647) gives a widely used table:
| Planet | Full orb | Moiety (half) | |---|---|---| | Sun | 15° | 7.5° | | Moon | 12° | 6° | | Jupiter | 9° | 4.5° | | Saturn | 9° | 4.5° | | Mars | 7° | 3.5° | | Venus | 7° | 3.5° | | Mercury | 7° | 3.5° |
To use it, add the two moieties. A Venus-Jupiter sextile allows 3.5 plus 4.5, so 8 degrees of orb, which means it holds from 52 to 68 degrees of separation. Modern astrology instead fixes the orb to the aspect and keeps the sextile fairly tight, commonly around 3 to 6 degrees and usually narrower than the trine, sometimes widened for the Sun and Moon. Sources such as Al-Biruni and Lilly vary a little, so treat any single figure as a convention, not a law.
Applying versus separating, and reading it descriptively
Whether a sextile is applying or separating governs its weight and timing. When the faster planet is still closing toward the exact 60 degrees, the aspect is applying and is read as stronger and future-leaning; once it has passed exactitude and the angle is opening, it is separating and treated as waning or already expressed. Retrograde motion can reverse which planet is applying, so check the direction of travel. This distinction is central to horary and electional work.
Read descriptively, a natal sextile names a supportive, compatible link between two planetary significations, a resource or latent facility you can choose to develop, not a fixed event. The "opportunity" is symbolic potential answering to your own agency, never a promise that a transit will hand you a result; any concrete outcome depends on the planets involved, the whole chart, and your choices. This also sets the sextile apart from the 30-degree semisextile and the 150-degree quincunx, which are classically aversions where the signs do not behold each other. The sextile, by contrast, is a true aspect of regard. To see how it combines with others, explore chart aspect patterns and how the planets' dignities color what any aspect delivers.
Frequently Asked Questions
Is a sextile a good aspect?
It is traditionally harmonious, a lesser benefic, so its flow is favorable and cooperative. Its actual value depends on the planets it connects and their condition, and it describes a supportive tendency rather than a guaranteed good event.
What is the difference between a sextile and a trine?
Both are agreeing aspects, but the trine (120 degrees) joins signs of the same element and is stronger, while the sextile (60 degrees) joins signs of the same polarity only and is lighter. Modern astrology often frames the trine as effortless ease and the sextile as an opportunity you activate.
What orb should I use for a sextile?
Classically the orb belongs to the planets: add each planet's moiety (half its orb) to find the maximum. Modern practice instead assigns a fixed orb to the aspect, usually about 3 to 6 degrees, often a touch narrower than the trine.
Which signs form a sextile?
Signs 60 degrees apart, two signs away and sharing polarity: fire with air and earth with water. Aries sextiles Gemini and Aquarius; Taurus sextiles Cancer and Pisces; Leo sextiles Gemini and Libra, and so on around the wheel.
Keep exploring your chart
The sextile rewards a reader who treats it as latent potential to work with, not a forecast. To find yours, cast a free birth chart and see which planets sit 60 degrees apart, then go deeper with a personality report or browse more guides on the blog.
