How calculation works (high level)
The calculator builds planetary-hour windows from trusted astronomical events for your location and local timezone, then applies continuity checks so boundaries stay stable across date shifts and DST changes.
Detailed implementation internals are intentionally limited in public documentation to protect the engine from direct cloning.
What you can rely on
- ✦Location-aware sunrise/sunset foundation.
- ✦Consistent day/night continuity in local civil time.
- ✦Stable presentation in both 12h and 24h display modes.
Next: How to read the table.