Rule
Dark Skies
Denali - Dark Skies - Alaska
Healy, 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
Pristine Dark Skies (pristine)
Denali
Today · 21:04–23:00 · 2h window
Medium confidence
51%
🌛Moon Altitude0.1-6°
☁️Total Cloud Coverage3.1-3.8%
Pristine Dark Skies (pristine)
Denali
Tomorrow · 06:00–07:00
🌛Moon Altitude:9.9°
Medium
Pristine Dark Skies (pristine) at Sunrise
Denali
Tomorrow · 07:00–09:00
🌛Moon Altitude:-2.1-4.2°
Medium
Pristine Dark Skies (pristine)
Denali
Tomorrow · 09:00–16:00
🌛Moon Altitude:-35.1--8.7°
Medium
Pristine Dark Skies (pristine)
Denali
Tue, Mar 10 · 19:00–07:00
🌛Moon Altitude:-54.2--5.5°
Low
Pristine Dark Skies (pristine) at Sunrise
Denali
Wed, Mar 11 · 07:00–08:00
🌛Moon Altitude:-3.2°
Medium
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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 | ✕ | 84% | 12016m | 0% | 99% | -18° |
| 17:00 | ✕ | 82% | 3984m | 0% | 99% | -13° |
| 18:00 | ✕ | 91% | 2417m | 0.001% | 99% | -8° |
| 19:00 | ✕ | 96% | 1968m | 0% | 99% | -2.1° |
| 20:00 | ✕ | 100% | 2199m | 0% | 99% | 4.1° |
| 21:00 | ✓ | 100% | 2997m | 0% | 99% | 10° |
| 22:00 | ✓ | 100% | 3808m | 0% | 99% | 16° |
| 23:00 | ✓ | 99% | 4809m | 0% | 99% | 20° |
| Wed, Mar 4 | ||||||
| 24:00 | ✓ | 85% | 6284m | 0% | 99% | 24° |
| 01:00 | ✓ | 66% | 10505m | 0% | 99% | 26° |
| 02:00 | ✓ | 27% | 23469m | 0% | 99% | 26° |
| 03:00 | ✓ | 5% | 24134m | 0% | 99% | 25° |
| 04:00 | ✓ | 5% | 24134m | 0% | 99% | 22° |
| 05:00 | ✓ | 4.3% | 24134m | 0% | 99% | 17° |
| 06:00 | ✓ | 4.3% | 24135m | 0% | 99% | 12° |
| 07:00 | ✓ | 4.3% | 24135m | 0% | 99% | 5.4° |
| 08:00 | ✓ | 4.3% | 24135m | 0% | 99% | -1.2° |
| 09:00 | ✓ | 4.3% | 24135m | 0% | 99% | -7.8° |
| 10:00 | ✓ | 3.6% | 24135m | 0% | 99% | -14° |
| 11:00 | ✓ | 3.2% | 24134m | 0% | 99% | -20° |
| 12:00 | ✓ | 3.8% | 24134m | 0% | 99% | -24° |
| 13:00 | ✓ | 3.8% | 24135m | 0% | 99% | -27° |
| 14:00 | ✓ | 4.5% | 24135m | 0% | 99% | -29° |
| 15:00 | ✕ | 7% | 24134m | 0% | 96% | -29° |
| 16:00 | ✕ | 21% | 24135m | 0% | 96% | -26° |
| 17:00 | ✕ | 22% | 21379m | 0% | 96% | -23° |
| 18:00 | ✕ | 29% | 19883m | 0% | 96% | -18° |
| 19:00 | ✕ | 27% | 20158m | 0% | 96% | -12° |
| 20:00 | ✕ | 4.3% | 24135m | 0% | 96% | -6.1° |
| 21:00 | ✓ | 3.8% | 24134m | 0% | 96% | 0.09° |
| 22:00 | ✓ | 3.1% | 24135m | 0% | 96% | 6° |
| 23:00 | ✓ | 3.1% | 24135m | 0% | 96% | 11° |
| Thu, Mar 5 | ||||||
| 24:00 | ✓ | 3.1% | 24134m | 0% | 96% | 16° |
| 01:00 | ✓ | 3.1% | 24134m | 0% | 96% | 19° |
| 02:00 | ✓ | 3.1% | 24134m | 0% | 96% | 20° |
| 03:00 | ✓ | 3.1% | 24135m | 0% | 96% | 20° |
| 04:00 | ✓ | 3.1% | 24134m | 0% | 96% | 18° |
| 05:00 | ✓ | 3.1% | 24134m | 0% | 96% | 15° |
| 06:00 | ✓ | 3.1% | 24134m | 0% | 96% | 9.9° |
| 07:00 | ✓ | 3.1% | 24135m | 0% | 96% | 4.2° |
| 08:00 | ✓ | 3.1% | 24135m | 0% | 96% | -2.1° |
| 09:00 | ✓ | 3.4% | 24135m | 0% | 96% | -8.7° |
| 10:00 | ✓ | 5% | 24134m | 0% | 96% | -15° |
| 11:00 | ✓ | 1.1% | 24134m | 0% | 96% | -21° |
| 12:00 | ✓ | 1% | 24134m | 0% | 96% | -27° |
| 13:00 | ✓ | 10% | 24134m | 0% | 96% | -31° |
| 14:00 | ✓ | 10% | 24135m | 0% | 96% | -34° |
| 15:00 | ✓ | 9.6% | 24134m | 0% | 90% | -35° |
| 16:00 | ✓ | 42% | 24135m | 0% | 90% | -34° |
| 17:00 | ✓ | 63% | 24135m | 0% | 90% | -31° |
| 18:00 | ✓ | 67% | 24134m | 0% | 90% | -27° |
| 19:00 | ✓ | 61% | 24134m | 0% | 90% | -22° |
| 20:00 | ✓ | 65% | 24134m | 0% | 90% | -16° |
| 21:00 | ✓ | 30% | 24135m | 0% | 90% | -9.7° |
| 22:00 | ✓ | 59% | 24134m | 0% | 90% | -3.6° |
| 23:00 | ✓ | 100% | 24135m | 0% | 90% | 2.1° |
| Fri, Mar 6 | ||||||
| 24:00 | ✓ | 100% | 24134m | 0% | 90% | 7° |
| 01:00 | ✓ | 100% | 24134m | 7.4% | 90% | 11° |
| 02:00 | ✓ | 100% | 24135m | 15% | 90% | 13° |
| 03:00 | ✓ | 100% | 18328m | 22% | 90% | 14° |
| 04:00 | ✓ | 100% | 17786m | 25% | 90% | 14° |
| 05:00 | ✓ | 100% | 16851m | 27% | 90% | 11° |
| 06:00 | ✓ | 100% | 2734m | 30% | 90% | 7.7° |
| 07:00 | ✓ | 100% | 2764m | 48% | 90% | 2.9° |
| 08:00 | ✓ | 100% | 1472m | 66% | 90% | -2.8° |
| 09:00 | ✓ | 100% | 1704m | 84% | 90% | -9.1° |
| 10:00 | ✓ | 100% | 2217m | 86% | 90% | -16° |
| 11:00 | ✓ | 100% | 24134m | 89% | 90% | -22° |
| 12:00 | ✓ | 100% | 24134m | 91% | 90% | -28° |
| 13:00 | ✓ | 100% | 4805m | 94% | 90% | -34° |
| 14:00 | ✓ | 93% | 5999m | 96% | 90% | -38° |
| 15:00 | ✓ | 99% | 4547m | 99% | 84% | -40° |
| 16:00 | ✓ | 100% | 2110m | 96% | 84% | -41° |
| 17:00 | ✓ | 100% | 8241m | 93% | 84% | -39° |
| 18:00 | ✓ | 100% | 7136m | 90% | 84% | -36° |
| 19:00 | ✓ | 100% | 5965m | 93% | 84% | -31° |
| 20:00 | ✓ | 72% | 5075m | 95% | 84% | -25° |
| 21:00 | ✓ | 100% | 2671m | 98% | 84% | -19° |
| 22:00 | ✓ | 99% | 1908m | 93% | 84% | -13° |
| 23:00 | ✓ | 97% | 1145m | 87% | 84% | -6.9° |
| Sat, Mar 7 | ||||||
| 24:00 | ✓ | 96% | 383m | 82% | 84% | -1.5° |
| 01:00 | ✓ | 97% | 371m | 87% | 84% | 3° |
| 02:00 | ✓ | 99% | 359m | 91% | 84% | 6.4° |
| 03:00 | ✓ | 100% | 347m | 95% | 84% | 8.5° |
| 04:00 | ✓ | 100% | 367m | 85% | 84% | 9° |
| 05:00 | ✓ | 100% | 387m | 74% | 84% | 8° |
| 06:00 | ✓ | 100% | 407m | 64% | 84% | 5.4° |
| 07:00 | ✓ | 100% | 433m | 73% | 84% | 1.6° |
| 08:00 | ✓ | 100% | 460m | 82% | 84% | -3.4° |
| 09:00 | ✓ | 100% | 487m | 91% | 84% | -9.1° |
| 10:00 | ✓ | 100% | 414m | 82% | 84% | -15° |
| 11:00 | ✓ | 100% | 340m | 73% | 84% | -22° |
| 12:00 | ✓ | 100% | 267m | 64% | 84% | -28° |
| 13:00 | ✓ | 99% | 309m | 70% | 84% | -35° |
| 14:00 | ✓ | 98% | 352m | 76% | 84% | -40° |
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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