An opposition is tension held across a distance.

The two planets sit as far apart as the circle allows, in opposing signs, and each pulls toward what the other cannot accommodate — so the person experiences a genuine either/or, and generally feels that satisfying one means betraying the other. Sun opposite Saturn is the wish to shine against the requirement to be sober. Venus opposite Mars is affection against appetite. Neither side is wrong, which is exactly the problem.

What the description conceals is that oppositions tend to arrive through other people. Because the far end of an opposition is uncomfortable to inhabit, it is frequently disowned and then met from outside — the person who keeps encountering demanding partners may be encountering their own Mars, and the person exhausted by other people's needs may be meeting a Moon they have declined to acknowledge. This is why oppositions are read alongside the seventh house as the mechanism of projection, and why they are the most visible aspects in any life. Others can usually name yours long before you can.

Their resolution is not to choose. An opposition is asking for both — alternately, or in some arrangement that holds the two without collapsing either — and the people who manage it describe a widening rather than a compromise. What makes an opposition workable is the recognition that it is one axis rather than two enemies.

Their difficulty is oscillation. Left unaddressed, an opposition swings: years spent entirely at one end, then a reversal, then back again, with the excluded half accumulating pressure while it waits. A chart heavy in oppositions describes a life of considerable awareness and considerable strain, since nothing in it is ever simply settled.

A square is friction, and it is the most productive difficulty a chart contains.

The two planets fall in signs of the same mode but incompatible elements, so they want the same timing and entirely different things — which means neither can proceed without obstructing the other. It is experienced as a recurring problem rather than an occasional one, and it does not resolve so much as develop.

What the description conceals is that squares are where competence comes from. An aspect that resists must be worked at, and something worked at for thirty years becomes skill. The accomplished people in any field generally have squares involving the relevant planets rather than trines, because ease develops nothing. Saturn square Mercury produces the writer who found language difficult and therefore learned it properly. Saturn square Venus produces the person who had to learn how to love and consequently knows how.

Their particular danger is misattribution. Because the friction is internal, repetitive and lifelong, it reads as a character flaw rather than a structure — the person concludes there is something wrong with them, when in fact there is something demanding in their chart. That distinction matters practically: a flaw invites shame, and a structure invites work.

Squares involve the four cardinal signs together, the four fixed signs together, or the four mutable signs together, which is why the mode of a square tells you how it behaves. Cardinal squares fight and move on. Fixed squares dig in and last for decades. Mutable squares scatter, reappearing in a slightly different form each time.

A trine is ease.

The two planets share an element, so they understand each other without translation and their functions cooperate without effort. It is the most comfortable aspect in a chart and generally describes a genuine talent — something the person does well and has always done well, without any memory of learning it.

What the description conceals is that trines are frequently squandered. Because the capacity requires no work it attracts no attention, and a great many people cannot name their own trines at all: the ability is so available that it registers as unremarkable rather than exceptional. A chart full of trines can describe a pleasant and curiously unaccomplished life — every advantage present and none of it pressed.

The other thing worth knowing is that a trine will not insist. A square demands to be addressed; a trine offers, and then waits indefinitely. It can go entirely unused for decades without ever making a nuisance of itself. So the useful question about a trine is never what it gives you but whether you have bothered to pick it up.

Their difficulty, such as it is, is complacency. Trines make things easy, and easy is not always what a situation requires. Jupiter trine the Sun gives confidence that has not been tested; Venus trine Neptune gives charm that has never needed substance behind it. The gift is real. Whether anything is made of it is not decided by the aspect.

A sextile is opportunity.

The two planets sit in compatible elements — fire with air, earth with water — so they cooperate readily, but the connection is looser than a trine and requires some participation to activate. It is help that is available rather than help that arrives.

What the description conceals is that sextiles are the most easily overlooked aspect in a chart. They are neither difficult enough to demand attention nor automatic enough to operate unbidden, so they tend to lie dormant for years. When they are noticed and used, they are among the most reliably useful things a chart contains — the aspect that quietly makes something possible without ever announcing itself.

Their significance is chiefly practical. A sextile is where a skill can be built with modest effort rather than great effort, and it is frequently the route by which a difficult aspect elsewhere is worked around. When reading a chart it is worth asking what the sextiles connect: they often describe the resources a person has and does not know they have.

Their difficulty is inertia. A sextile that goes unrecognised does nothing at all, and unlike a trine it does not even produce an effortless talent — it produces a possibility that was never taken up.

Determines how strongly the aspect is felt.

Planets are almost never at precisely ninety or a hundred and twenty degrees, so the tradition permits a margin of approximation: a square at eighty-seven degrees is still a square, a trine at a hundred and twenty-four is still a trine. That margin is the Orb.

Within a degree or two an aspect is continuous and defining — it describes something central to a life. At six or eight degrees it is present but faint, a background influence rather than an organising one. Beyond that it is generally set aside. Conjunctions and oppositions are usually allowed the widest orb, around eight degrees; squares and trines slightly less; sextiles less again.

What the description conceals is that orb is what separates an important aspect from a merely technical one. Two charts can list the same aspect and mean quite different things by it, one exact and one barely in range. After the planets themselves, orb is the first thing to check — because it tells you which aspects actually run a person and which are only noted.

An aspect is called applying while the angle is still closing toward exactness and separating once it has passed: the first read as gathering strength, the second as releasing it.