| Population Center | Distance | Census | Mitigation |
| Alturas | 45 miles | 2,900 | Mountains |
| Susanville | 56 miles | 13,000 | Mountains |
| Klamath Falls | 86 miles | 20,000 | Mountains |
| Redding | 87 miles | 105,000 | Mountains |
The inverse square law as applied to these cities means, every time you halve the distance, the brightness of its light domes quadruples.
Population's increase of a light dome is probably linear, in which case the absolute brightness of Redding would be over four times that of Klamath Falls.
No light domes were visible during the 2007 observing trip to the Adin site.
See how GSSP compares to other star party locations.
