Astrocartography Meaning | PsychicSmile
Astrocartography Meaning: Putting Your Birth Chart on a Map
Astrocartography meaning starts with a simple idea: a birth chart belongs to a place as well as a moment, and moving to a new place changes how the chart shows up. Astrocartography takes the birth chart and projects it onto a world map, drawing lines across the globe that show where each planet was rising, setting, culminating, or at its lowest point at the moment of birth. The technique was developed in the 1970s by the American astrologer Jim Lewis, who published his Astro*Carto*Graphy booklet in 1976 and built a mail order service around hand drawn maps before software existed. Lewis service-marked the term and filed a US patent on the overlay technique, which was granted in 1981. The practice is also called locational astrology or relocation astrology, though the map and the relocated chart are different tools. The map shows where the action is. The relocated chart shows the full picture for one place, and synastry does the same kind of comparison between two people. The map does not replace the natal chart. It relocates it, and every place on Earth becomes a new lens through which the birth sky expresses itself.
Jim Lewis and the 1976 Maps
Jim Lewis, born James Lewis Slayden, lived from 1941 to 1995, and he began working on the technique in the late 1960s and through the 1970s. His insight was practical. Instead of recalculating a relocated chart for every city a client asked about, he could precompute where each planet would appear on the horizon or at the zenith for any given birth moment, then draw those locations as continuous lines across a world map. The first map was hand drawn in 1971. By 1973 Lewis had computerized the process, running calculations on the university mainframe at the University of California, Berkeley. The first commercially available maps were sold in the mid 1970s, and the booklet of 1976 set out the method in full. Lewis worked with Michael Erlewine, who wrote the first astrocartography software in the late 1970s. The book Astro*Carto*Graphy: The Book of Maps, published in 1989 with Arielle Guttman, mapped chart data for 136 notable figures against their career geographies, and it remains the foundational text. Lewis died in 1995, and the technique moved into mainstream use as astrology software incorporated it in the early 2000s. The history matters because it shows that the map is a modern invention in astrology, not an ancient one. Relocated charts are old. The world map with personal lines on it is Jim Lewis, in the 1970s, with a patent number.
The 40 Lines: Four Angles for Ten Planets
A standard astrocartography map carries 40 lines: four lines for each of the ten planets. Each line marks where a planet was angular at the moment of birth, on one of the four angles of the chart. The Ascendant line marks where the planet was rising on the eastern horizon. The Descendant line marks where the planet was setting on the western horizon. The Midheaven line marks where the planet was culminating, at the highest point in the sky. The Imum Coeli line marks where the planet was at its lowest point, beneath the feet. The Midheaven and Imum Coeli lines are straight meridians running pole to pole, because they follow lines of longitude. The Ascendant and Descendant lines curve, because the horizon curves with latitude. Ten planets times four angles gives 40 lines, though some lines overlap or converge, especially near the poles. The standard orb for a line influence is roughly 600 to 700 miles, or about 10 degrees of longitude at mid latitudes, so a person can be up to a few hundred miles from a line and still feel its effect. Parans, the latitudes where two lines cross, are read as especially potent, and Lewis introduced them in the 1976 booklet. A paran is a place where two planetary themes meet at once, and the reading combines both.
What Each Line Type Means
The four line types read differently, because each angle governs a different area of life. An Ascendant line is where the planet was rising. It governs self presentation, identity, and how others perceive the person in that place. A Jupiter Ascendant line often reads as a place where the person is seen as generous and optimistic. A Saturn Ascendant line often reads as a place where the person is seen as serious and reserved. A Descendant line is where the planet was setting. It governs relationships, partnerships, and open encounters with others. A Venus Descendant line often reads as a place where relationships come easily. A Mars Descendant line often reads as a place where conflict or competition shows up through other people. A Midheaven line is where the planet was culminating. It governs career, public reputation, and life direction. A Sun Midheaven line often reads as a place where the person is visible and recognized. A Neptune Midheaven line often reads as a place where the career is creative but unclear. An Imum Coeli line is where the planet was at its lowest point. It governs home, family, private life, and roots. A Moon Imum Coeli line often reads as a place that feels like home quickly. A Pluto Imum Coeli line often reads as a place where deep family patterns come up for transformation. The planet gives the theme. The angle gives the arena. The combination gives the reading for that place.
Astrocartography Map or Relocated Chart: Two Different Tools
Astrocartography and relocation charts answer different questions, and confusing them is the most common mistake in this part of astrology. An astrocartography map shows lines across the whole world at once. It tells a person where the action is, but not the rest of the chart. A relocation chart is a full birth chart calculated for a new location, as if the person had been born there. The planets stay in the same signs and aspects, because the moment of birth does not change, but the houses shift, because the angles change with place. A relocation chart gives the complete picture for one city: house placements, aspects, and dignities, while a composite chart gives the combined picture of two charts. The map is better for comparing many places at a glance. The relocation chart is better for understanding one place in depth. The usual workflow uses both: the map to narrow the choice to a few cities, then a relocation chart for each candidate city to see the full picture. An error of an hour in the birth time moves the lines by about 15 degrees of longitude, which is about 1,000 miles at the equator, so an accurate birth time matters as much for the map as it does for the houses. Without a reliable time, the lines are a guess, and the map should not be used to choose a move.
An Illustrative Example: Tessa and the Jupiter Line
This example is illustrative, not a real person's story. Tessa was born in Chicago with Jupiter in the ninth house, and her astrocartography map showed a Jupiter Midheaven line running down the west coast of the United States, close to Seattle, and a Saturn Descendant line running through the east coast, close to Boston. She had lived in Chicago for years, where neither line was near, and her career had been steady but unremarkable. When a job offer came from Seattle, she checked the map and the relocation chart together. The relocation chart for Seattle moved her Jupiter to the tenth house, close to the Midheaven, and moved her Saturn away from the angles. The Boston option, which she had also considered, put Saturn on the Descendant in the relocation chart, with a seventh house emphasis on partnership strain. She chose Seattle, and the first two years there brought the visibility the Jupiter line pointed at: a promotion, a conference talk, and a wider professional network. The example does not prove the line caused the change. It shows the method working as intended. The map named the places where Jupiter was angular. The relocation chart confirmed the picture for one city. Tessa made the choice, and the choice carried the result.
How to Read Your Own Map
Reading an astrocartography map starts with the birth data: the exact date, time and place of birth, because the lines depend on all three. Generate the map from a reliable calculator or software, and look first at the lines that pass near places that matter: the current home, the cities under consideration, and the places where the person has already lived. Compare the map with lived experience, and check it against the Sun sign reading of the same chart. A place where life went well should show supportive lines, such as Jupiter or Venus on an angle. A place where life was hard should show heavier lines, such as Saturn or Pluto on an angle. If the map and the memory disagree, check the birth time first, because an hour error moves the lines far. Then read the line crossings, the parans, since a crossing of two lines marks a place where two themes meet and the reading is stronger. Then cast a relocation chart for the strongest candidate cities, and read the houses. The map alone is a sketch. The relocation chart is the detail. The final caution is the most important one. The lines are not guarantees. They are activations. A Jupiter line does not hand a person success. It marks a place where the Jupiter themes of the chart are more visible and more available. What the person does with that visibility decides the outcome, and the same line can read as opportunity for one person and as overextension for another.
A reader weighing a move can ask an advisor to go through the relocation lines and the houses they touch live. First 3 minutes FREE — every time, for every reading, with all advisors.
For a simple next step, try a One-Card Tarot reading and reflect on which city on your map holds the strongest line for the life you want.
Frequently Asked Questions
What is astrocartography?
It is the practice of projecting a birth chart onto a world map to identify locations where planetary energies show most strongly. Each line marks where a planet was rising, setting, culminating, or at its lowest point at the moment of birth. The technique was developed in the 1970s by the American astrologer Jim Lewis.
How many lines are on an astrocartography map?
A standard map carries 40 lines: four lines for each of the ten planets, one for each of the four angles, the Ascendant, Descendant, Midheaven and Imum Coeli. The Midheaven and Imum Coeli lines run pole to pole, while the Ascendant and Descendant lines curve. Some lines overlap or converge, especially near the poles.
What is the difference between astrocartography and a relocation chart?
An astrocartography map shows lines across the whole world at once and tells you where the action is, but not the rest of the chart. A relocation chart is a full birth chart calculated for one new location, with the same planets in the same signs but different houses. The map is better for comparing places, and the relocation chart is better for understanding one place in depth.
How accurate does my birth time need to be for astrocartography?
Very accurate. An error of an hour moves the lines by about 15 degrees of longitude, which is about 1,000 miles at the equator. A birth time from a certificate or hospital record is the best source, and without a reliable time the lines should not be used to choose a move.
Can astrocartography tell me where to move?
It can show where the planetary themes of your chart are most visible and available, but it cannot choose for you. The lines are activations, not guarantees. A Jupiter line marks a place where Jupiter themes are strong, and what you do with that visibility decides the outcome. Always read the map together with a relocation chart for the city under consideration.
Last updated: November 12, 2026
