The map is the chart on the earth
The birth chart is a snapshot of the sky at the moment and place you were born. Astrocartography asks a second question: if you had been born at that same instant but somewhere else, which planets would have been on your angles? The answer, rendered globally, draws a line for each planet across every spot on the earth where it was rising (Ascendant), setting (Descendant), at its highest (Midheaven, the MC), or at its lowest (Imum Coeli, the IC) at your birth moment.
Places near those lines don't make something happen — they amplify. A Venus line near a city doesn't guarantee you'll fall in love there; it means Venus themes — aesthetic sensibility, relational magnetism, the pull of beauty and pleasure — get louder in your life there. A Saturn line amplifies the opposite: discipline, solitude, responsibility, the hard work that lasts. Every major city on earth sits under some combination of your lines. The question the map asks is: which combination do you want to be louder, and which quieter?
The four angles
Each planet produces four lines. MC (where it culminated at noon of your birth), IC (where it was at midnight of your birth), Ascendant (where it was rising), Descendant (where it was setting). MC and IC are vertical; Ascendant and Descendant are curved.
Lines have an orb
A line's influence extends roughly 500 miles to either side — strong within 200 miles, subtle out to 700. Crossings (two lines intersecting) are the most loaded points on the map. A Jupiter-Venus crossing is different from a Saturn-Mars one.
Not deterministic
Astrocartography indicates atmosphere, not destiny. The planet's condition in your natal chart shapes how strongly each line expresses. A well-placed Venus writes sweeter lines than an afflicted one.
Frequently Asked Questions
What is astrocartography?
Astrocartography is a locational astrology technique developed by the American astrologer Jim Lewis beginning in 1976. It takes your birth chart and projects the positions of the planets onto a world map, drawing lines where each planet was rising (Ascendant), setting (Descendant), culminating overhead (Midheaven / MC) or at its lowest point (Imum Coeli / IC) at the moment you were born. Cities near one of your lines are places where that planet's themes become more pronounced in your life when you are there.
How do I read my astrocartography map?
Read your map one planet at a time. Each planet produces four lines — its MC line, IC line, Ascendant line, and Descendant line. Focus first on the planets whose themes you care about: Venus for love and beauty, Jupiter for expansion, Sun for visibility, Saturn for structure and maturity, Mars for drive. The planet's archetype colors locations within roughly 500 miles of its lines. Crossings — where two planetary lines intersect — are especially loaded places.
Who invented astrocartography?
Astrocartography in its modern form was developed by Jim Lewis (1941–1995), an American astrologer who began producing hand-drawn mail-order maps for clients in 1976 and branded the technique Astro*Carto*Graphy. Earlier locational astrology ideas — relocation charts, parans, angular emphasis — go back to antiquity, but the global map-with-lines format Lewis popularized is the standard form of the technique today. His 1989 book The Psychology of Astro*Carto*Graphy remains the foundational reference.
What is a Venus line?
A Venus line is a location where Venus was on the horizon or meridian at the moment of your birth. When you visit or live near one of your Venus lines, Venus themes — love, beauty, art, pleasure, relational magnetism — tend to rise to the surface. The Venus MC line (Venus culminating) often correlates with public recognition for your aesthetic or relational gifts. The Venus AC line (Venus rising) tends to correlate with being seen as more attractive there. Venus does not guarantee romance; it amplifies what is already yours.
Should I move to one of my good lines?
Astrocartography is interpretive — not deterministic. Moving to a Jupiter MC line will not automatically make you successful; it will, in most people's experience, amplify Jupiter themes there (expansion, travel, teaching, publication, risk of overreach). The technique works best as one input among many. A common experiment: visit a line before committing. Spend two weeks in a city near your Jupiter or Venus line and pay attention to what happens. Permanent relocation based solely on a line is rarely wise; using lines to choose between otherwise reasonable options is where the technique earns its keep.
Do I need my exact birth time?
Yes — more than for most astrological techniques. The MC and IC lines shift by about one degree of longitude every four minutes, which is roughly 70 miles of east-west movement for every four minutes of birth-time error. A birth time accurate to within five minutes is ideal. If you only know your birth time to within an hour, treat the vertical lines as approximate corridors. The curved Ascendant and Descendant lines are somewhat less sensitive but still benefit from accuracy.
What's the difference between astrocartography and a relocation chart?
A relocation chart takes your birth chart and recalculates the house cusps as if you had been born in a different city. Astrocartography uses the same math but visualizes it globally: instead of recalculating city by city, it draws the lines where each planet was on an angle at birth, so you can see at a glance which cities sit under which influence. The two techniques are consistent. Astrocartography answers where in the world? The relocation chart answers what would my chart look like if I moved here?
How accurate is this calculator?
Planetary positions are computed client-side using Meeus's algorithms (Sun, Moon) and NASA/JPL keplerian element approximations (Mercury through Pluto), valid for dates 1800–2050. Typical accuracy is within 0.1° to 0.5° — more than sufficient for astrocartography line plotting, where a half-degree of sky corresponds to about 35 miles of longitude. For professional research, Swiss Ephemeris-grade calculations would add another decimal place of precision, but the visible line positions on a world map would not change.
What is a power crossing in astrocartography?
A power crossing is a location on earth where two of your planetary lines intersect within roughly seventy miles of each other. At a crossing, both planets' archetypes compound — a Venus–Jupiter crossing amplifies pleasure, abundance, and good fortune simultaneously; a Saturn–Pluto crossing intensifies restructuring and transformation. Crossings are rarer than single lines and tend to produce more vivid, life-altering effects when visited or lived under. Most people have between three and eight crossings worldwide, depending on how strict the proximity threshold is. The full Cosmos Daily Relocation Atlas identifies your crossings explicitly.
Which planetary lines are best for moving?
It depends on what you want to amplify. For expansion, opportunity, and wealth: Jupiter lines, especially Jupiter MC. For love and aesthetic life: Venus AC or MC. For public visibility and career identity: Sun MC. For inner work and roots: well-placed Moon IC. The hard lines — Saturn, Mars, Pluto, sometimes Uranus and Neptune — are not "bad," but they amplify their planet's signature, which can be punishing if that planet is poorly placed in your natal chart. The right question is not "which line is best?" but "which planet is strongest in MY chart, and therefore safest to amplify?"
Which planetary lines should I avoid?
The lines to avoid are the lines of your trap planets — planets in essential debility in your natal chart (detriment or fall). If your natal Mars is in Cancer (fall), Mars lines will amplify a force that is already running roughly in your chart. If your Saturn is in Aries (fall), Saturn lines will magnify restriction and resentment. These cities can be visited but rarely lived in productively. The Cosmos Daily reading identifies your specific trap planets and names the cities to step away from — the anti-list.
When is the best time to relocate based on astrocartography?
Astrocartography names the where; annual profections and zodiacal releasing name the when. Each year activates one of your natal houses; when that house's ruler also touches a strong astrocartographic line, the location and the timing align. Jupiter return years (every 12 years) and Saturn return years (ages 27–30, 56–60) are also classic relocation windows. Moving on a Jupiter MC line during a Jupiter-ruled profection year is the kind of compound timing that experienced astrologers look for. The full reading factors this in.
How far from a line do I need to be to feel its effects?
Jim Lewis's original guidance was an orb of about 700 miles on either side of a line for strong effects, with influence tapering past that. Most contemporary practitioners use a tighter orb — around 300 miles for primary effect, 500 miles for noticeable, and beyond 700 miles only background hum. Living directly on a line (within ~70 miles) is the most concentrated experience; visiting briefly within an orb of 300 miles produces a milder but recognizable signature. The "miles" number on this calculator measures the closest line to each city.