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Astrocartography: how to read planetary lines on a world map

The four line types, zones of influence, parans, and what a move actually changes

Astrocartography projects a natal chart onto a map of the world. The idea is simple: for the moment of birth there are points on Earth where a given planet was rising, setting, at the zenith or at the nadir in that very second. Those points form lines, and the lines can be drawn on a globe. Below is what each line type means, how wide its effect reaches, and where interpretation stops.

Where the lines come from

A natal chart records a moment in time, not a place: in that second the planets stand where they stand, identically for the whole Earth. What changes is something else, namely the angle at which a planet is seen from a particular point on the surface. In Kyiv at 09:30 Mars may be high in the sky, while in Los Angeles in the same second it is below the horizon. Astrocartography finds every point on Earth where a planet was exactly on the horizon or exactly on the meridian at the moment of birth and joins them into a curve. That gives four lines per planet, around forty lines on the map in total.

The four line types

The AC line marks places where the planet was rising: its quality shows in how a person is seen and how they enter contact. The DC line is where the planet was setting: the theme of partnership, of encounters, of what arrives through other people. The MC line is where the planet stood at the zenith: the public, professional, visible side, which is why MC lines are most often read for career. The IC line is the nadir, the opposite of the MC: home, roots, the private, what is not visible from outside. AC and DC are curves that bend and can close into loops at high latitudes, while MC and IC are almost straight meridians.

Zone of influence and the orb in kilometres

A line is not a thread but the spine of a zone. The accepted working estimate is roughly 500 kilometres to each side for the major bodies, with a gradual falloff: 50 kilometres from the line the theme sounds sharp, at 400 it is already background. There is no exact figure here, and different schools put it anywhere from 300 to 1000 kilometres, so it is sensible to read not whether you are on a line but how close you are. Crossings deserve separate attention: a city where a Venus MC line meets a Jupiter AC line reads differently from a city near a single line.

Parans

Besides the four lines per planet there are parans, that is, latitudes at which two planets cross angular points simultaneously: one rises while the other is at the zenith. A paran is not a curve but a horizontal band around the whole Earth at a given latitude, and it works within roughly one degree. Parans are useful because they fuse two themes into one: a band where Venus rises together with Saturn at the zenith reads as the theme of commitment inside closeness. They are usually taken as a second layer, once the main lines have been worked through.

Relocation: what a move changes

The first thing a move does not change is the planets' positions by sign: the Sun stays where it was at birth, because that is a property of the moment, not of the place. What changes are the houses, the ascendant and the MC, because those are computed from the horizon of a specific point. A relocated chart is therefore the same chart at a different angle: the same aspects, different emphases across areas of life. Astrocartography and relocation describe one and the same thing in two languages, and it is useful to read them together rather than one instead of the other.

How to use this in practice

A sensible order is this. First look at which lines pass through the places where you have already lived and compare them with what actually happened there: this is the only check of the method available on your own data. Then look at a direction rather than a single point: a Jupiter line runs through dozens of cities, and the choice between them is decided by visas, language and work, not by astrology. Only as a third step look at crossings and parans for a specific question.

Limits of the method

The geometry here is exact: the lines are computed from spherical trigonometry and verified against independent sources. What is not exact is the interpretation: the width of the zone of influence, the set of meanings for each line and the weight of parans are convention, not measured fact. Astrocartography does not predict events and is not grounds for a decision about moving: visas, language, work, prices and closeness to family all weigh more than any line. The sensible use is as an extra lens once the options have already been narrowed by other criteria.

Next

Astrocartography in the app → Natal Chart Online → The natal chart: where to start →

Lines and parans are computed in your browser via Swiss Ephemeris. The astrocartography map with lines, parans and zones is available in the app.

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