Opposition in astrology: when two planets face each other

An opposition is when two planets sit 180° apart, on exactly opposite sides of the zodiac. They face each other across your chart like two people at either end of a long dinner table, each with a point to make. The work of an opposition is learning to hear both of them.

Opposition at a glance

Angle: 180°
Symbol: Two small circles joined by a line
Hali’s orb: 8°, or 10° when the Sun or Moon is involved
Nature: Pull between two ends, a call for balance
Traditional family: Hard, alongside the square
Signs it links: Opposite signs, same mode, complementary elements

What does an opposition mean in astrology?

It means two parts of you are pulling in opposite directions, and each one makes the other easier to see. If your Moon is opposite Saturn, the wish to be held and the wish to hold everything together can take turns running the show.

Oppositions often play out through other people. You might find yourself drawn to partners, friends or rivals who carry one end of the seesaw while you carry the other. That’s one reason astrologers link oppositions with relationships, and why they are such a lively part of synastry.

Venus opposite Mars, for example, can feel like magnetism, the attraction of opposites with a little push and pull built in. Mercury opposite Jupiter can swing between careful detail and the big picture, which makes for great conversation once both sides are invited.

Why do oppositions feel like a seesaw?

Because opposite signs share a mode and sit in complementary elements. Fire faces air and earth faces water. Aries faces Libra, me and we. Taurus faces Scorpio, what I have and what we share.

So the two ends of an opposition aren’t strangers. They’re more like two halves of a question. Many astrologers say the aim isn’t to pick a winner but to find the point in the middle where both can stand.

How close does an opposition need to be?

Hali counts an opposition when two planets are within 8° of the exact 180°, widened to 10° when the Sun or Moon is one of them, because the lights are traditionally given more room.

Tighter oppositions pull harder. Your Hali reading shows the exact orb next to each one, like “Moon opposite Saturn · 3.0°”, so you can feel out how strong the pull is.

How common are oppositions?

Oppositions are the least common of the five major aspects, though most charts still have at least one. These figures come straight from Hali’s own calculations.

Measure	Result
Charts with at least one opposition	78.9%
Average per chart	1.8

Most common oppositions	Share of charts
SunoppositeNeptune	5.8%
SunoppositePluto	5.7%
SunoppositeMoon	5.6%
MoonoppositeVenus	5.6%
MoonoppositeJupiter	5.6%
MoonoppositeSaturn	5.6%

From Hali's own calculation of 40,000 random charts between 1950 and 2049, using the ten planets and Hali's orbs.

Oppositions between slow outer planets last for years and belong to a generation. Those involving your Sun, Moon, Mercury, Venus and Mars are personal, and they are often the ones people recognise first.

What is the difference between applying and separating oppositions?

An applying opposition is one where the faster planet is still moving toward the exact 180°. A separating opposition is one where it has already passed it.

Many astrologers read an applying opposition as tension still gathering, a conversation that hasn’t happened yet, and a separating one as a tension you’ve already started to balance. Hali’s engine tracks which is which for every aspect in your chart.

What did traditional astrologers say about the opposition?

Ptolemy listed the opposition among his five aspects and grouped it with the square as disharmonious. Later astrologers called the square and opposition the hard aspects, and the trine and sextile soft.

Modern astrologers tend to describe the opposition as awareness. A planet you can see straight across the room is hard to ignore, and that visibility is part of its gift.

Which oppositions happen in the sky?

The best known is the Full Moon, when the Sun and Moon sit on opposite sides of the Earth every month and the Moon shines all night. Anyone born near a Full Moon has the Sun opposite the Moon in their chart.

Mercury and Venus never oppose the Sun, because they always stay close to it from where we stand. Mercury and Venus can’t oppose each other either, for the same reason.

Every opposition, planet by planet

Each pair has its own page, read in one chart and between two people.

Frequently asked questions

Is an opposition bad?

No. It’s called a hard aspect because it creates tension between two ends, but that tension is what helps you see both sides of yourself. Many people find their oppositions become their sense of balance.

What is the orb for an opposition?

Hali uses 8°, or 10° when the Sun or Moon is involved. Other astrologers use slightly different orbs, which is one reason two apps can list different aspects for the same chart.

What’s the difference between an opposition and a square?

Both are hard aspects. A square is two planets at a right angle, creating friction that pushes you to act. An opposition is two planets facing each other, asking you to balance them rather than choose.

Can an opposition fall in signs that aren’t opposite?

Yes. Near the edge of a sign, two planets can be 180° apart by degree while sitting in signs that aren’t opposite each other. Astrologers call this an out of sign or dissociate opposition, and some give it a little less weight.

Sources and methods

Frequencies computed by Hali from random charts using the ten planets and Hali’s orbs (8° for oppositions, 10° with the Sun or Moon). The note under the tables gives the sample.

The opposition as a disharmonious aspect follows Ptolemy, Tetrabiblos, Book I. Lunar phases from computed planetary positions. Our data is free to use under CC BY 4.0.

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Three thousand years, explained.