The forty lines.

Where the body was: the planet was on the eastern horizon at the moment you were born, just coming up, about to be visible.

The Ascendant is the angle of arrival and of first contact, how a place meets you before it knows anything about you, and what it assumes. A planet here colours the version of yourself a place calls forward. You feel it in the first hour: whether the street lifts you or asks something of you, the pace your feet find without deciding, the face you notice you are already wearing.

A rising line is a horizon curve, not a straight line. It sweeps across the map in a long arc, steepening as it leaves the equator, because where a body rises depends on both longitude and latitude at once. Past a certain latitude the curve stops altogether: a body far enough from the celestial equator becomes circumpolar and never rises there at all, so the line genuinely ends rather than continuing.

Where the body was: the planet was on the western horizon at the moment you were born, setting, on its way out of view.

The Descendant is the angle of the other person, partnership, clients, counterparts, the people a place puts in front of you. A planet here shapes who you tend to meet and what those meetings tend to be about. You feel it across a table: how quickly a stranger becomes a conversation, whether the room leans toward you or waits, what the place seems to want from you before it gives.

A setting line is a horizon curve, the mirror of the rising one, and it obeys the same rule. It arcs rather than running straight, it steepens away from the equator, and it ends where the body stops setting at all. Where a rising and a setting line converge, the body is only just clearing the horizon.

Where the body was: the planet stood at its highest point in the sky at the moment you were born, crossing the meridian, directly overhead.

The Midheaven is the angle of public standing, the work you are known for, what a place puts your name to, and what it will let you build in the open. A planet here is the one other people can see. You feel it as weather on your reputation: the ease or the effort of being taken seriously here, and the particular thing about you that this place decides to notice.

An overhead line is a meridian. It runs dead straight from pole to pole down a single longitude, which makes it the simplest of the four to place and the only kind that exists at every latitude without exception. A city either sits near that longitude or it does not; how far north or south it lies never rules it out.

Where the body was: the planet was at its lowest point at the moment you were born, beneath your feet, on the far side of the earth.

The Imum Coeli is the angle of private life, home, rest, roots, the part of a place you only meet once you stop performing in it. A planet here works on you quietly and over time rather than in public. You feel it when the door closes: the exhale, or its absence, whether the place lets you set the day down, and how deeply the sleep goes.

An underfoot line is a meridian too, running pole to pole exactly opposite the overhead one: the two are always 180° of longitude apart. So a planet standing overhead in one place is underfoot half a world away, and the pair of lines always arrive together.