Astrolium's astrocartography map is the visual scan a practitioner opens first. One render shows all 28 planetary lines projected across the world, the four angular line types (AC, DC, MC, IC) per planet, and the paran-grade power zones where two or more lines converge inside 250 km. Use it to read the overall geographic pattern of a chart before drilling into a single city or short list.
Jim Lewis systematised the technique in the 1970s; the math behind it is older. At any longitude on Earth, you can compute which planets would have been on the four angles at the moment of birth. The result is a map of where each planet sits in a client's geography. The map is the entry point for relocation prep, travel timing reads, and any consultation that needs a geographic frame.
What the map renders
The Astrolium map uses the /v3/astrocartography/map endpoint and draws the full Swiss Ephemeris line set in one render. You get an SVG world map about 1200 by 600 pixels, expandable to fullscreen for closer reading. Above each line, the planet glyph and angle code identify what the line carries. Hover or zoom for line meanings.
Below the map, the calculator shows three reading layers:
- Power zones — the 50 strongest line crossings, ranked by combined strength (0–100%). Each zone lists the planets and angles that meet, a one-line meaning, a category (career, love, health, identity, and others), and whether the contact is supportive or challenging. Use this list to find the geography that activates a specific theme.
- Birth location anchor — coordinates and a marker for the city you entered. Useful for sanity-checking the math and for seeing how far your birth city sits from any of your own lines.
- Cities near your lines — a table of up to 47 cities that fall close to a line, sorted by distance. Each row shows the closest planet/line pair, distance in kilometres, and whether the city sits inside a power zone. Useful when you want a real city to consider, not just a coordinate.
The render itself takes 3–5 seconds; the map is computed server-side on every submit, not cached, so the lines reflect your exact birth data.
Reading the lines
Four line types repeat across all 10 planets:
AC (Ascendant) — the planet rose on the eastern horizon at that longitude. AC lines shape personal identity and how people first read you. Venus on AC tends to bring social ease and aesthetic attention; Saturn on AC is heavy at first and rewards persistence.
MC (Midheaven) — the planet stood at the top of the sky. MC lines govern career, public reputation, and what you become known for. Jupiter on MC expands professional opportunity. Saturn on MC is demanding but often where serious work gets done.
DC (Descendant) — the planet set on the western horizon. DC lines govern partnerships, marriage, and one-to-one dynamics. Mars on DC can sharpen conflict; Venus on DC tends to draw significant partners.
IC (Imum Coeli) — the planet sat at the base of the sky, the fourth-house cusp. IC lines govern home, family, roots, and inherited material. Moon on IC often feels like home immediately. Pluto on IC can bring transformation through property or family matters.
The map shows all 28 lines at once. Most readings start by scanning for benefics (Venus, Jupiter, sometimes Sun and Moon) on the lines that match the life area you care about — Venus/AC for ease of self-presentation, Jupiter/MC for career opening, Moon/IC for a place that feels like home.
Power zones and how to use them
A power zone is a region where two or more lines cross within roughly 250 km. Those crossings stack planetary energies. The calculator ranks zones by combined strength and groups them by category. A Sun + Moon zone in the identity category amplifies self-realisation. A Saturn + Mars zone in the challenging category compresses pressure.
Use the power-zone list as a shortlist of geography worth investigating. A high-strength supportive zone over a habitable region is the kind of place practitioners flag for relocation work. A challenging zone over a region you visit often is worth understanding before you spend years there.
After the map
The map answers "which lines exist and where." It does not answer "which city should I pick" or "how does this geography feel in detail." Those questions belong to the rest of the toolset.
Related practitioner tools
- Astrocartography Calculator — score a single location against the chart for client consults
- Astrocartography City Finder — search 200+ cities by life area
- Astrocartography Compare — head-to-head comparison of 2–5 cities
- Astrocartography Power Zones — top 12 line crossings and paran zones
- Relocation Chart — full relocated chart for any city
- Local Space Chart — directional lines from the birth place
For deeper interpretation, see the astrocartography hub guide. For natal context the map draws from, use the natal chart report. For timing layer, pair with the transit report and the profections calculator.