Rule
Dark Skies
Girdwood - Dark Skies - Alaska
Girdwood, Alaska, United States
Moonless nights with crystal-clear skies for deep-sky photography
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in America/Anchorage
Next opportunity
Good Dark Skies at Dawn
Girdwood
Tue, Mar 10 · 07:00–08:00 · 1h window
Medium confidence
42%
🌛Moon Altitude1.6°
☁️Total Cloud Coverage12.6%
Good Dark Skies at Sunrise
Girdwood
Tue, Mar 10 · 08:00–09:00
🌛Moon Altitude:1.3°
Low
Good Dark Skies
Girdwood
Tue, Mar 10 · 12:00–14:00
🌛Moon Altitude:-20.2--13.9°
Low
Good Dark Skies
Girdwood
Tue, Mar 10 · 19:00–21:00
🌛Moon Altitude:-57.1--56.2°
Low
Pristine Dark Skies (pristine)
Girdwood
Wed, Mar 11 · 24:00–07:00
🌛Moon Altitude:-38.3--3°
Low
Pristine Dark Skies (pristine) at Sunrise
Girdwood
Wed, Mar 11 · 07:00–09:00
🌛Moon Altitude:-0.4-0.6°
Low
Pristine Dark Skies (pristine)
Girdwood
Thu, Mar 12 · 13:00–07:00
🌛Moon Altitude:-55.9--8.8°
Low
+2 more windows in the next 10 days
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72-hour requirements breakdown
What passed or failed, hour by hourOR logic: one branch per group is enough
Meets requirement
Misses requirement
Time America/Anchorage | Astronomical Night Any | Total Cloud Coverage ≤ 20.0% | Visibility ≥ 12000.0m | Precipitation Chance ≤ 10.0% | Moon Illumination OR1·B1≤ 35.0% | Moon Altitude OR1·B2≤ 10.0° |
|---|---|---|---|---|---|---|
| Tue, Mar 3 | ||||||
| 16:00 | ✕ | 14% | 24134m | 0% | 99% | -20° |
| 17:00 | ✕ | 7.5% | 24134m | 0% | 99% | -15° |
| 18:00 | ✕ | 4.6% | 24135m | 0% | 99% | -9.2° |
| 19:00 | ✕ | 0.3% | 24134m | 0% | 99% | -2.6° |
| 20:00 | ✓ | 0.6% | 24134m | 0% | 99% | 4.2° |
| 21:00 | ✓ | 0.6% | 24134m | 0% | 99% | 11° |
| 22:00 | ✓ | 0.1% | 24135m | 0% | 99% | 17° |
| 23:00 | ✓ | 0% | 24135m | 0% | 99% | 23° |
| Wed, Mar 4 | ||||||
| 24:00 | ✓ | 0% | 24134m | 0% | 99% | 27° |
| 01:00 | ✓ | 2.4% | 24135m | 0% | 99% | 29° |
| 02:00 | ✓ | 2.4% | 24134m | 0% | 99% | 29° |
| 03:00 | ✓ | 3% | 24134m | 0% | 99% | 28° |
| 04:00 | ✓ | 40% | 24134m | 0% | 99% | 24° |
| 05:00 | ✓ | 46% | 24134m | 0% | 99% | 19° |
| 06:00 | ✓ | 38% | 24135m | 0% | 99% | 13° |
| 07:00 | ✓ | 4.7% | 24135m | 0% | 99% | 6.2° |
| 08:00 | ✓ | 4.3% | 24135m | 0% | 99% | -1.1° |
| 09:00 | ✓ | 2.5% | 24135m | 0% | 99% | -8.3° |
| 10:00 | ✓ | 2.5% | 24135m | 0% | 99% | -15° |
| 11:00 | ✓ | 0.1% | 24134m | 0% | 99% | -21° |
| 12:00 | ✓ | 0% | 24134m | 0% | 99% | -27° |
| 13:00 | ✓ | 0% | 24135m | 13% | 99% | -30° |
| 14:00 | ✓ | 0% | 24135m | 26% | 99% | -32° |
| 15:00 | ✕ | 0% | 24134m | 39% | 96% | -31° |
| 16:00 | ✕ | 0% | 24135m | 49% | 96% | -29° |
| 17:00 | ✕ | 2.6% | 24134m | 60% | 96% | -25° |
| 18:00 | ✕ | 2.9% | 24134m | 70% | 96% | -19° |
| 19:00 | ✕ | 15% | 24134m | 74% | 96% | -13° |
| 20:00 | ✓ | 21% | 23285m | 78% | 96% | -6.3° |
| 21:00 | ✓ | 40% | 22977m | 82% | 96% | 0.53° |
| 22:00 | ✓ | 59% | 10683m | 82% | 96% | 7.1° |
| 23:00 | ✓ | 55% | 6359m | 82% | 96% | 13° |
| Thu, Mar 5 | ||||||
| 24:00 | ✓ | 99% | 5362m | 82% | 96% | 18° |
| 01:00 | ✓ | 100% | 5027m | 82% | 96% | 21° |
| 02:00 | ✓ | 100% | 5163m | 82% | 96% | 23° |
| 03:00 | ✓ | 100% | 5058m | 82% | 96% | 23° |
| 04:00 | ✓ | 100% | 4276m | 67% | 96% | 21° |
| 05:00 | ✓ | 100% | 5277m | 53% | 96% | 17° |
| 06:00 | ✓ | 100% | 6546m | 39% | 96% | 12° |
| 07:00 | ✓ | 100% | 6094m | 53% | 96% | 5.5° |
| 08:00 | ✓ | 100% | 1555m | 67% | 96% | -1.4° |
| 09:00 | ✓ | 100% | 775m | 82% | 96% | -8.6° |
| 10:00 | ✓ | 100% | 549m | 67% | 96% | -16° |
| 11:00 | ✓ | 100% | 1560m | 53% | 96% | -23° |
| 12:00 | ✓ | 100% | 4481m | 39% | 96% | -29° |
| 13:00 | ✓ | 100% | 6608m | 49% | 96% | -34° |
| 14:00 | ✓ | 100% | 8305m | 59% | 96% | -37° |
| 15:00 | ✓ | 99% | 6695m | 69% | 90% | -38° |
| 16:00 | ✓ | 81% | 9369m | 70% | 90% | -37° |
| 17:00 | ✓ | 96% | 6125m | 72% | 90% | -34° |
| 18:00 | ✓ | 100% | 4773m | 74% | 90% | -29° |
| 19:00 | ✓ | 100% | 1720m | 80% | 90% | -23° |
| 20:00 | ✓ | 100% | 828m | 87% | 90% | -16° |
| 21:00 | ✓ | 100% | 4232m | 93% | 90% | -9.6° |
| 22:00 | ✓ | 100% | 5700m | 93% | 90% | -2.8° |
| 23:00 | ✓ | 100% | 1190m | 94% | 90% | 3.4° |
| Fri, Mar 6 | ||||||
| 24:00 | ✓ | 100% | 241m | 94% | 90% | 8.9° |
| 01:00 | ✓ | 100% | 336m | 96% | 90% | 13° |
| 02:00 | ✓ | 100% | 587m | 98% | 90% | 16° |
| 03:00 | ✓ | 100% | 1437m | 99% | 90% | 17° |
| 04:00 | ✓ | 100% | 1053m | 99% | 90% | 17° |
| 05:00 | ✓ | 100% | 810m | 99% | 90% | 14° |
| 06:00 | ✓ | 100% | 207m | 99% | 90% | 10° |
| 07:00 | ✓ | 100% | 276m | 99% | 90% | 4.7° |
| 08:00 | ✓ | 100% | 428m | 100% | 90% | -1.6° |
| 09:00 | ✓ | 100% | 334m | 100% | 90% | -8.5° |
| 10:00 | ✓ | 100% | 359m | 98% | 90% | -16° |
| 11:00 | ✓ | 94% | 642m | 97% | 90% | -23° |
| 12:00 | ✓ | 87% | 584m | 95% | 90% | -30° |
| 13:00 | ✓ | 72% | 4018m | 96% | 90% | -36° |
| 14:00 | ✓ | 100% | 1976m | 98% | 90% | -40° |
| 15:00 | ✓ | 98% | 1814m | 99% | 84% | -43° |
| 16:00 | ✓ | 100% | 809m | 97% | 84% | -44° |
| 17:00 | ✓ | 100% | 92m | 95% | 84% | -42° |
| 18:00 | ✓ | 100% | 67m | 93% | 84% | -38° |
| 19:00 | ✓ | 100% | 57m | 95% | 84% | -32° |
| 20:00 | ✓ | 100% | 56m | 97% | 84% | -26° |
| 21:00 | ✓ | 100% | 87m | 99% | 84% | -19° |
| 22:00 | ✓ | 99% | 120m | 97% | 84% | -12° |
| 23:00 | ✓ | 98% | 152m | 95% | 84% | -5.9° |
| Sat, Mar 7 | ||||||
| 24:00 | ✓ | 97% | 185m | 93% | 84% | 0.11° |
| 01:00 | ✓ | 98% | 470m | 95% | 84% | 5.2° |
| 02:00 | ✓ | 99% | 755m | 96% | 84% | 9° |
| 03:00 | ✓ | 100% | 1040m | 98% | 84% | 11° |
| 04:00 | ✓ | 100% | 729m | 93% | 84% | 12° |
| 05:00 | ✓ | 100% | 419m | 89% | 84% | 11° |
| 06:00 | ✓ | 100% | 108m | 85% | 84% | 8° |
| 07:00 | ✓ | 100% | 152m | 86% | 84% | 3.8° |
| 08:00 | ✓ | 100% | 196m | 88% | 84% | -1.6° |
| 09:00 | ✓ | 100% | 240m | 90% | 84% | -7.9° |
| 10:00 | ✓ | 100% | 6232m | 91% | 84% | -15° |
| 11:00 | ✓ | 100% | 12224m | 92% | 84% | -22° |
| 12:00 | ✓ | 100% | 18215m | 93% | 84% | -29° |
| 13:00 | ✓ | 96% | 16617m | 92% | 84% | -36° |
| 14:00 | ✓ | 92% | 15019m | 91% | 84% | -42° |
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.
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