Antiscia and contra-antiscia in traditional astrology
Points mirrored across the solstice axis — a real traditional technique modern software mostly ignores.
3 min read · Published 29 August 2026
The short answer
An antiscion is a planet's mirror point reflected across the solstice axis, the line from 0° Cancer to 0° Capricorn. Two positions that are antiscia of each other receive equal daylight hours. Contra-antiscia mirror across the equinox axis instead. Both are genuine techniques from traditional astrology, treated as hidden connections between planets that show no ordinary aspect.
How to find one
Reflect the position across the 0° Cancer to 0° Capricorn axis. Practically: subtract the degree from 30° Gemini, or note that Aries mirrors Virgo, Taurus mirrors Leo, Gemini mirrors Cancer, and so on.
| Sign | Mirrors to | Example |
|---|---|---|
| Aries | Virgo | 10° Aries → 20° Virgo |
| Taurus | Leo | 5° Taurus → 25° Leo |
| Gemini | Cancer | 15° Gemini → 15° Cancer |
| Libra | Pisces | 10° Libra → 20° Pisces |
| Scorpio | Aquarius | 5° Scorpio → 25° Aquarius |
| Sagittarius | Capricorn | 15° Sagittarius → 15° Capricorn |
The pairs always sum to 30 degrees within their signs, which is the arithmetic check. Contra-antiscia use the equinox axis instead — the 0° Aries to 0° Libra line — and simply take the opposite point of the antiscion.
Why the solstice axis
Because it is the axis of daylight length, and that is the physical basis of the technique.
Two degrees that are antiscia of each other correspond to dates with equal day length — one on the way toward the summer solstice and one on the way back. The Sun at 10° Taurus and the Sun at 20° Leo produce the same amount of daylight.
So the connection is not arbitrary symmetry. It links positions sharing a real measurable property, which makes antiscia one of the better-motivated traditional techniques.
Contra-antiscia mirror the equinox axis, linking positions with equal night length instead.
How they are used
As hidden aspects. Two planets showing no ordinary relationship in longitude may sit in antiscion contact, and traditional practice reads that as a genuine connection.
Orbs are tight — typically one to two degrees, considerably tighter than for ordinary aspects, on the basis that the contact is subtler.
They appear throughout medieval and Renaissance astrological literature and are used in horary work particularly, where a hidden connection between significators can decide a judgement.
Modern astrology largely dropped them, and the revival of traditional technique over recent decades has brought them back into use among practitioners working from the older sources — the same movement that revived sect.
Whether to bother
If you are working in a traditional framework, they are part of the toolkit and omitting them means using half a method.
If you are reading a chart in the modern psychological mode, they add another layer of connection to an already crowded picture — and the combinatorial caution applies: more techniques means more available interpretations until something always fits.
AsterNym does not compute antiscia. It is a stated omission rather than a judgement on the technique, and the arithmetic is simple enough to do by hand from the table above if you want to check your own chart.
Common questions
- What is an antiscion?
- A planet's mirror point reflected across the solstice axis, from 0° Cancer to 0° Capricorn. Two positions that are antiscia of each other correspond to dates with equal daylight length, which is the physical basis of the technique.
- How do I calculate my antiscia?
- Reflect each position across the solstice axis: Aries mirrors Virgo, Taurus mirrors Leo, Gemini mirrors Cancer, Libra mirrors Pisces, Scorpio mirrors Aquarius and Sagittarius mirrors Capricorn. The degrees within the paired signs always sum to 30.
- What is a contra-antiscion?
- The mirror across the equinox axis, from 0° Aries to 0° Libra, rather than the solstice axis. It links positions of equal night length and is simply the opposite point of the antiscion.
- Are antiscia used in modern astrology?
- Largely not. They appear throughout medieval and Renaissance literature, especially in horary work, and have returned to use among practitioners working from traditional sources — the same revival that brought back sect.