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
Excellent Dark Skies (pristine)
Denali
Fri, Feb 20 · 18:00–21:00 · 3h window
Low confidence
38%
🌛Moon Altitude22.2-31.8°
☁️Total Cloud Coverage5.1-5.3%
Pristine Dark Skies (pristine)
Denali
Fri, Feb 20 · 21:00–07:00
🌛Moon Altitude:-13.4-16.3°
Low
Pristine Dark Skies (pristine) at Sunrise
Denali
Sat, Feb 21 · 07:00–10:00
🌛Moon Altitude:-6.7-3.8°
Low
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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° |
|---|---|---|---|---|---|---|
| Mon, Feb 16 | ||||||
| 04:00 | ✓ | 100% | 1161m | 0% | 1.2% | -32° |
| 05:00 | ✓ | 96% | 1615m | 0% | 1.2% | -26° |
| 06:00 | ✓ | 98% | 2341m | 0% | 1.2% | -19° |
| 07:00 | ✓ | 76% | 5180m | 0% | 1.2% | -13° |
| 08:00 | ✓ | 72% | 7093m | 0% | 1.2% | -6.3° |
| 09:00 | ✓ | 65% | 9281m | 0% | 1.2% | -0.78° |
| 10:00 | ✓ | 58% | 10559m | 0% | 1.2% | 3.9° |
| 11:00 | ✓ | 33% | 20842m | 0% | 1.2% | 7.4° |
| 12:00 | ✓ | 5% | 24135m | 0% | 1.2% | 9.5° |
| 13:00 | ✓ | 5% | 24134m | 0% | 1.2% | 10° |
| 14:00 | ✓ | 5% | 24134m | 0% | 1.2% | 9.1° |
| 15:00 | ✕ | 5% | 24134m | 0% | 0% | 6.7° |
| 16:00 | ✕ | 5% | 24134m | 0% | 0% | 2.9° |
| 17:00 | ✕ | 5% | 24134m | 0% | 0% | -1.9° |
| 18:00 | ✕ | 5% | 24135m | 0% | 0% | -7.5° |
| 19:00 | ✕ | 100% | 24134m | 0% | 0% | -14° |
| 20:00 | ✓ | 81% | 24134m | 0% | 0% | -20° |
| 21:00 | ✓ | 99% | 24134m | 0% | 0% | -26° |
| 22:00 | ✓ | 100% | 24134m | 0% | 0% | -31° |
| 23:00 | ✓ | 100% | 24134m | 0% | 0% | -35° |
| Tue, Feb 17 | ||||||
| 24:00 | ✓ | 100% | 24134m | 0% | 0% | -38° |
| 01:00 | ✓ | 100% | 24135m | 0% | 0% | -39° |
| 02:00 | ✓ | 100% | 24134m | 0% | 0% | -38° |
| 03:00 | ✓ | 100% | 24135m | 0% | 0% | -35° |
| 04:00 | ✓ | 100% | 24134m | 0% | 0% | -31° |
| 05:00 | ✓ | 100% | 24135m | 0% | 0% | -25° |
| 06:00 | ✓ | 100% | 24135m | 0% | 0% | -19° |
| 07:00 | ✓ | 98% | 24134m | 0% | 0% | -13° |
| 08:00 | ✓ | 98% | 24135m | 0% | 0% | -6.1° |
| 09:00 | ✓ | 96% | 24134m | 0% | 0% | 0.15° |
| 10:00 | ✓ | 100% | 24134m | 0% | 0% | 5.7° |
| 11:00 | ✓ | 97% | 24134m | 0% | 0% | 10° |
| 12:00 | ✓ | 100% | 24134m | 0% | 0% | 14° |
| 13:00 | ✓ | 100% | 24134m | 0% | 0% | 16° |
| 14:00 | ✓ | 92% | 24134m | 0% | 0% | 16° |
| 15:00 | ✓ | 79% | 24135m | 0% | 1.2% | 14° |
| 16:00 | ✓ | 93% | 24134m | 13% | 1.2% | 12° |
| 17:00 | ✓ | 92% | 24135m | 26% | 1.2% | 7.5° |
| 18:00 | ✓ | 100% | 24135m | 39% | 1.2% | 2.3° |
| 19:00 | ✓ | 100% | 24134m | 53% | 1.2% | -3.5° |
| 20:00 | ✓ | 100% | 24135m | 68% | 1.2% | -9.6° |
| 21:00 | ✓ | 100% | 24135m | 82% | 1.2% | -16° |
| 22:00 | ✓ | 100% | 24134m | 83% | 1.2% | -21° |
| 23:00 | ✓ | 100% | 17685m | 83% | 1.2% | -26° |
| Wed, Feb 18 | ||||||
| 24:00 | ✓ | 100% | 15882m | 84% | 1.2% | -30° |
| 01:00 | ✓ | 100% | 24135m | 87% | 1.2% | -33° |
| 02:00 | ✓ | 100% | 24134m | 91% | 1.2% | -33° |
| 03:00 | ✓ | 100% | 24134m | 95% | 1.2% | -32° |
| 04:00 | ✓ | 98% | 24134m | 96% | 1.2% | -29° |
| 05:00 | ✓ | 100% | 24135m | 98% | 1.2% | -24° |
| 06:00 | ✓ | 100% | 24134m | 100% | 1.2% | -18° |
| 07:00 | ✓ | 100% | 6396m | 100% | 1.2% | -12° |
| 08:00 | ✓ | 100% | 396m | 100% | 1.2% | -5.4° |
| 09:00 | ✓ | 100% | 726m | 100% | 1.2% | 1.2° |
| 10:00 | ✓ | 100% | 453m | 100% | 1.2% | 7.4° |
| 11:00 | ✓ | 100% | 352m | 100% | 1.2% | 13° |
| 12:00 | ✓ | 100% | 217m | 99% | 1.2% | 17° |
| 13:00 | ✓ | 100% | 179m | 99% | 1.2% | 21° |
| 14:00 | ✓ | 100% | 160m | 100% | 1.2% | 22° |
| 15:00 | ✓ | 100% | 123m | 100% | 4.5% | 22° |
| 16:00 | ✓ | 100% | 141m | 74% | 4.5% | 20° |
| 17:00 | ✓ | 100% | 166m | 48% | 4.5% | 17° |
| 18:00 | ✓ | 100% | 230m | 22% | 4.5% | 12° |
| 19:00 | ✓ | 100% | 591m | 23% | 4.5% | 6.9° |
| 20:00 | ✓ | 13% | 24135m | 25% | 4.5% | 0.93° |
| 21:00 | ✓ | 8.4% | 24134m | 26% | 4.5% | -5.2° |
| 22:00 | ✓ | 4.9% | 24134m | 36% | 4.5% | -11° |
| 23:00 | ✓ | 2.3% | 24135m | 46% | 4.5% | -17° |
| Thu, Feb 19 | ||||||
| 24:00 | ✓ | 57% | 24135m | 56% | 4.5% | -21° |
| 01:00 | ✓ | 44% | 24135m | 65% | 4.5% | -25° |
| 02:00 | ✓ | 86% | 24135m | 74% | 4.5% | -26° |
| 03:00 | ✓ | 100% | 24135m | 83% | 4.5% | -26° |
| 04:00 | ✓ | 100% | 24134m | 87% | 4.5% | -25° |
| 05:00 | ✓ | 99% | 4630m | 91% | 4.5% | -21° |
| 06:00 | ✓ | 100% | 225m | 95% | 4.5% | -16° |
| 07:00 | ✓ | 100% | 160m | 94% | 4.5% | -11° |
| 08:00 | ✓ | 100% | 254m | 93% | 4.5% | -4.4° |
| 09:00 | ✓ | 100% | 270m | 93% | 4.5% | 2.2° |
| 10:00 | ✓ | 100% | 295m | 80% | 4.5% | 8.8° |
| 11:00 | ✓ | 100% | 320m | 68% | 4.5% | 15° |
| 12:00 | ✓ | 100% | 345m | 56% | 4.5% | 20° |
| 13:00 | ✓ | 100% | 331m | 65% | 4.5% | 25° |
| 14:00 | ✓ | 100% | 317m | 73% | 4.5% | 28° |
| 15:00 | ✓ | 100% | 304m | 82% | 10% | 29° |
| 16:00 | ✓ | 100% | 387m | 82% | 10% | 28° |
| 17:00 | ✓ | 100% | 471m | 82% | 10% | 26° |
| 18:00 | ✓ | 100% | 555m | 82% | 10% | 22° |
| 19:00 | ✓ | 100% | 714m | 82% | 10% | 17° |
| 20:00 | ✓ | 100% | 873m | 82% | 10% | 12° |
| 21:00 | ✓ | 100% | 1032m | 82% | 10% | 5.5° |
| 22:00 | ✓ | 100% | 1059m | 66% | 10% | -0.6° |
| 23:00 | ✓ | 100% | 1086m | 49% | 10% | -6.4° |
| Fri, Feb 20 | ||||||
| 24:00 | ✓ | 100% | 1113m | 33% | 10% | -12° |
| 01:00 | ✓ | 100% | 1447m | 35% | 10% | -16° |
| 02:00 | ✓ | 100% | 1782m | 37% | 10% | -19° |
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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