Astrocartography answers "where should I live?" by ranking places against a specific goal rather than against your chart as a whole. There is no single best city in a birth chart. There is a best city for love, a best city for work, and a best city for rest, and they are usually not the same place.
Every planet draws four lines across the world map, one for each angle. The planet describes what the place amplifies; the angle describes how it reaches you. Start from what you actually want to change:
If you cannot name the goal, astrocartography will not choose for you. The map is a filter, not an oracle.
A finished astrocartography map has around forty lines on it. Almost everyone freezes at that point. The way through is to reduce in this order:
Three candidate cities is a usable answer. Forty is not.
The single most useful thing you can do with an astrocartography map is visit before committing. A line is a hypothesis; a two-week trip is the experiment. Go, and pay attention to concrete things rather than atmosphere:
Relocation lines describe a tendency, not a guarantee. A short trip tells you whether the tendency actually shows up in your life or stays theoretical.
Some lines are not "bad", but they demand something specific and are poor choices for a first move:
Being honest about the limits makes the technique more useful, not less. Astrocartography does not account for the cost of living, immigration law, the job market, your health insurance, or whether your partner wants to move. It also cannot rank two cities that sit on the same line — a Venus DC line through a country of eighty million people passes through hundreds of towns, and the chart does not distinguish between them. Use the map to shortlist; use ordinary research to decide.
You can, and many people do. Be aware that a line amplifies its planet continuously. A Mars line that is energising for a year can become exhausting over ten. Some people rotate: they live on a Moon or Venus line and travel to a Jupiter or Sun line for work.
Then look at paran lines, which run horizontally across the map and catch places that no vertical line reaches. Paran influence is subtler but far more widely distributed, so almost everyone has usable parans near home.
Yes. Effects are strongest within about 100 km and fade with distance. Living 400 km from a line and expecting a strong result is the most common mistake beginners make.
For angle-based lines, yes. The four angles rotate roughly one degree every four minutes, so a birth time that is off by an hour moves your lines by hundreds of kilometres. If your time is uncertain, treat the map as approximate and lean on planetary aspects rather than precise line placement.