Standard Jim Lewis in-mundo line method (MC/IC by meridian, ASC/DSC by true horizon crossing) with whole-sign relocated houses. Everything runs in your browser — no server, nothing stored.
Hover a line for its name. Click anywhere on the map to set it as the target location. ◯ birth place, ✛ target. ASC/DSC curves are drawn for latitudes −66° to +66°; circumpolar segments are omitted.