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Compare Planetary Lines for Two Cities

Enter one recorded birth moment and two coordinate pairs. Compare spherical distance to mapped natal rising, setting, MC, and IC curves, with the separate east–west crossing gap shown for each city.

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Birth moment

First city
Second city

Use the offset in force at the original birthplace, including daylight saving. The cities are observing points; their modern clock times do not change the birth instant. Find coordinates and a historical time zone →

How to read the comparison

The first two tables rank the eight nearest mapped angular curves in each city by spherical distance. For a selected planet, the detailed table gives the nearest point on each curve and the separate east–west arc to a line crossing at the city’s latitude. A rising or setting curve can approach from another latitude even when it has no crossing at the city’s own parallel; the detailed table labels that case rather than inventing a crossing.

Two places can have different nearest lines. That describes the geometry of a single natal moment, not the quality of a place or an outcome from travel. The full method guide explains the coordinate convention, map edges, crossings, and limits.