Astrology · Astrocartography
Your chart, projected onto the world.
Astro*Carto*Graphy: ten planets projected onto a world map at the moment of your birth. Where each planet was on the Midheaven, the Ascendant, the IC, the Descendant — drawn geographically. The places those lines cross are read as the ones that activate that planet’s themes the strongest.
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About astrocartography
What is astrocartography?
Astrocartography (often written Astro*Carto*Graphy, after Jim Lewis who popularized the technique in the 1970s) projects a birth chart onto a world map. For every planet, four lines mark the geographic longitudes and curves where that planet was, at the moment of birth, on one of the four chart angles: the Midheaven (MC, culminating overhead), the Imum Coeli (IC, at the bottom of the chart), the Ascendant (ASC, rising), and the Descendant (DSC, setting). Standing on or near a planetary line is read as activating that planet's themes in the life domain the angle governs.
What does the run produce?
Your full astrocartography map computed from arcsecond-grade ephemeris (VSOP87D for the planets, ELP2000 for the Moon). Ten classical bodies: Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. For each body: the MC and IC geographic longitudes (vertical lines on the map) plus ASC and DSC horizon curves (sampled every 1° of latitude, ±85° from the equator). The result page renders the world map with all forty lines color-coded by body and styled by angle, plus a per-line interpretation strip with practitioner notes. Free as of v2.215.
How do I read the map?
Each color is a body. Each line style is an angle. A solid line is the planet's MC line — its career-and-status pole over a location. A dashed line is its IC line — the foundation-and-private-life pole. A dotted line is its ASC line (rising, selfhood, the body). A dash-dot line is its DSC line (setting, partnership, the encountered other). Standing within a few hundred miles of a line tends to activate that body's themes in that life domain. Crossings — where two planets' lines meet on the map — are particularly weighted.
Is this a literal where-to-live recommendation?
It's a portrait, not a prescription. Astrocartography is one input among many — the Saturn line over a place doesn't mean don't go there; it suggests structure and effort tend to land more squarely on you in that place. The Jupiter line doesn't guarantee good fortune; it raises the felt sense of room to grow. Treat the map as a description of how a place is likely to interact with your chart, then weigh it against everything else (work, family, climate, the actual shape of your life). Practitioners use it to understand patterns across places they've lived, not to pick the next move blindly.
Why is birth time so important?
Astrocartography depends on the angles, and the angles rotate through all 360° of geographic longitude every 24 hours — roughly 15° per hour. A four-minute error in your birth time shifts every line by about 1° of longitude (~110 km at the equator). If your birth time is reliable to the minute, the map is sharp. If your time is uncertain by an hour or more, take the lines as broad zones, not exact lines. The fastest-moving angle is the Ascendant — its lines move fastest in response to time error.
Computation
Bodies computed from VSOP87D (planets) and a truncated ELP2000 (Moon). Ecliptic positions converted to equatorial via mean obliquity plus a low-precision nutation correction. MC longitude for each body is the geographic longitude where its right ascension equals the apparent sidereal time. ASC and DSC curves are sampled every 1° of latitude up to ±85° from the equator. The map renders directly to an equirectangular projection (longitude → x, latitude → −y) — accurate at the equator, distorted at high latitudes (a property of the projection, not the math).
