Check the numbers.
Understand the movement.
Explore the difference between a forward Sun–Moon arc and the shortest angular separation. Start with a hypothetical example or enter longitudes you already have.
What this checks
This tool checks arithmetic only. It does not obtain sky positions, calculate a birth chart, or verify an ephemeris. For a real reading, use positions from one timestamp and the same coordinate convention. Calculations run in this browser; the tool does not submit or save your entries.
Understand the required inputs ↗Enter two longitudes
ARITHMETIC RESULT · SUPPLIED LONGITUDES
Forward Sun–Moon arc
Collective station
Shortest separation
The smaller angle is used when assessing aspects. It does not replace the forward arc in the collective-station rule.
Read the station through four Worlds
Exact input equality is treated as zero here. No near-conjunction tolerance or aspect orb is applied. An actual reading must state those choices separately.
A worked example you can check
Hypothetical Sun 10°, Moon 350°: Moon minus Sun is 340°. The forward arc is therefore 340°. Divide by 36°, take the whole-number part, and add one: Station 10 / Malkuth / BUILD. The shorter angle is 360° − 340° = 20°. That 20° describes separation, not the station-selecting forward movement.
A station band includes its starting boundary and excludes its ending boundary. Thus an exact 36° arc belongs to Station 2, while 35.999999° belongs to Station 1. The tool preserves six decimal places internally using whole microdegrees, so it does not round a nearby value across a station boundary.