What this finder gives you
Each planet has four angular curves: rising at the eastern horizon (ASC), setting at the western horizon (DSC), crossing the upper meridian (MC), and crossing the lower meridian (IC). Select one curve for each of two different planets. Where both curves pass through the same latitude and longitude at the same recorded birth moment, the map marks a crossing. Some pairs do not intersect in the displayed domain.
The coordinates describe map geometry. They do not assign a good or bad destination or predict an outcome. Use the calculation and interpretation guide for the horizon limits, numerical method, parans, and birth-time uncertainty.
About the calculation
- Planetary positions and Greenwich sidereal time: Astronomy Engine 2.1.19. Coastline: Natural Earth 1:110m, public domain.