Rule
Dark Skies
Chena Hot Springs - Dark Skies - Alaska
Chena Hot Springs, 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)
Chena Hot Springs
Tue, Mar 17 · 23:00–02:00 · 3h window
Medium confidence
45%
🌛Moon Altitude-28.4--24.5°
☁️Total Cloud Coverage7.1-15.6%
Excellent Dark Skies (pristine)
Chena Hot Springs
Thu, Mar 19 · 22:58–04:43
🌛Moon Altitude:-14.7-0.3°
Low
Excellent Dark Skies (pristine)
Chena Hot Springs
Fri, Mar 20 · 23:03–04:38
🌛Moon Altitude:-8.3-5.4°
Low
Good Dark Skies
Chena Hot Springs
Sat, Mar 21 · 23:08–24:00
🌛Moon Altitude:15.5°
Medium
Pristine Dark Skies (pristine)
Chena Hot Springs
Sun, Mar 22 · 03:00–04:32
🌛Moon Altitude:-2.8--1.4°
Low
Excellent Dark Skies (pristine)
Chena Hot Springs
Mon, Mar 23 · 01:00–04:26
🌛Moon Altitude:2.6-13.9°
Low
Pristine Dark Skies (pristine)
Chena Hot Springs
Tue, Mar 24 · 04:00–04:21
🌛Moon Altitude:7.7°
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° |
|---|---|---|---|---|---|---|
| Sun, Mar 15 | ||||||
| 20:00 | ✕ | 85% | 24135m | 0% | 7.9% | -30° |
| 21:00 | ✕ | 100% | 24135m | 0% | 7.9% | -34° |
| 22:00 | ✓ | 100% | 24135m | 0% | 7.9% | -38° |
| 23:00 | ✓ | 100% | 24135m | 0% | 7.9% | -40° |
| Mon, Mar 16 | ||||||
| 24:00 | ✓ | 100% | 24135m | 0% | 7.9% | -41° |
| 01:00 | ✓ | 100% | 24135m | 0% | 7.9% | -39° |
| 02:00 | ✓ | 100% | 24135m | 0% | 7.9% | -36° |
| 03:00 | ✓ | 100% | 24135m | 0% | 7.9% | -31° |
| 04:00 | ✓ | 100% | 24135m | 0% | 7.9% | -25° |
| 05:00 | ✓ | 100% | 24134m | 0% | 7.9% | -19° |
| 06:00 | ✕ | 100% | 24135m | 0% | 7.9% | -13° |
| 07:00 | ✕ | 100% | 24134m | 0.001% | 7.9% | -6.7° |
| 08:00 | ✕ | 98% | 23997m | 0% | 7.9% | -0.97° |
| 09:00 | ✕ | 100% | 23849m | 0% | 7.9% | 4° |
| 10:00 | ✕ | 100% | 23847m | 0% | 7.9% | 8° |
| 11:00 | ✕ | 100% | 23814m | 0% | 7.9% | 11° |
| 12:00 | ✕ | 100% | 22785m | 0% | 7.9% | 12° |
| 13:00 | ✕ | 100% | 21123m | 0% | 7.9% | 12° |
| 14:00 | ✕ | 100% | 20995m | 0% | 7.9% | 9.8° |
| 15:00 | ✕ | 100% | 21270m | 0% | 7.9% | 6.7° |
| 16:00 | ✕ | 100% | 22609m | 0% | 2.9% | 2.4° |
| 17:00 | ✕ | 100% | 23104m | 0% | 2.9% | -2.7° |
| 18:00 | ✕ | 100% | 23839m | 0% | 2.9% | -8.3° |
| 19:00 | ✕ | 100% | 24135m | 0.001% | 2.9% | -14° |
| 20:00 | ✕ | 100% | 24135m | 0% | 2.9% | -20° |
| 21:00 | ✕ | 100% | 23912m | 0% | 2.9% | -25° |
| 22:00 | ✓ | 100% | 20958m | 0% | 2.9% | -30° |
| 23:00 | ✓ | 100% | 20657m | 1.1% | 2.9% | -33° |
| Tue, Mar 17 | ||||||
| 24:00 | ✓ | 100% | 23435m | 2.3% | 2.9% | -35° |
| 01:00 | ✓ | 100% | 23768m | 3.4% | 2.9% | -35° |
| 02:00 | ✓ | 100% | 14862m | 2.3% | 2.9% | -33° |
| 03:00 | ✓ | 100% | 10749m | 1.1% | 2.9% | -29° |
| 04:00 | ✓ | 100% | 11339m | 0% | 2.9% | -24° |
| 05:00 | ✕ | 100% | 10407m | 0% | 2.9% | -18° |
| 06:00 | ✕ | 100% | 6572m | 0% | 2.9% | -12° |
| 07:00 | ✕ | 100% | 3332m | 0.001% | 2.9% | -5.9° |
| 08:00 | ✕ | 100% | 3417m | 0% | 2.9% | 0.25° |
| 09:00 | ✕ | 100% | 3904m | 0% | 2.9% | 6° |
| 10:00 | ✕ | 100% | 4316m | 0% | 2.9% | 11° |
| 11:00 | ✕ | 100% | 3745m | 0% | 2.9% | 15° |
| 12:00 | ✕ | 100% | 3692m | 0% | 2.9% | 17° |
| 13:00 | ✕ | 100% | 5365m | 0% | 2.9% | 18° |
| 14:00 | ✕ | 100% | 10528m | 0% | 2.9% | 18° |
| 15:00 | ✕ | 100% | 20595m | 0% | 2.9% | 15° |
| 16:00 | ✕ | 100% | 23814m | 0% | 0.4% | 12° |
| 17:00 | ✕ | 100% | 24135m | 0% | 0.4% | 7.2° |
| 18:00 | ✕ | 100% | 24135m | 0% | 0.4% | 1.9° |
| 19:00 | ✕ | 100% | 24135m | 0% | 0.4% | -3.9° |
| 20:00 | ✕ | 95% | 24134m | 0% | 0.4% | -9.8° |
| 21:00 | ✕ | 72% | 24134m | 0% | 0.4% | -15° |
| 22:00 | ✓ | 59% | 24134m | 0% | 0.4% | -20° |
| 23:00 | ✓ | 16% | 24134m | 0% | 0.4% | -24° |
| Wed, Mar 18 | ||||||
| 24:00 | ✓ | 7.1% | 24134m | 0% | 0.4% | -27° |
| 01:00 | ✓ | 12% | 24135m | 0% | 0.4% | -28° |
| 02:00 | ✓ | 20% | 24134m | 0% | 0.4% | -28° |
| 03:00 | ✓ | 30% | 24135m | 0% | 0.4% | -25° |
| 04:00 | ✓ | 39% | 24135m | 0% | 0.4% | -22° |
| 05:00 | ✕ | 42% | 24135m | 0% | 0.4% | -17° |
| 06:00 | ✕ | 46% | 24135m | 0% | 0.4% | -11° |
| 07:00 | ✕ | 50% | 24135m | 0% | 0.4% | -4.8° |
| 08:00 | ✕ | 67% | 24135m | 0% | 0.4% | 1.5° |
| 09:00 | ✕ | 83% | 24135m | 0% | 0.4% | 7.7° |
| 10:00 | ✕ | 100% | 24135m | 0% | 0.4% | 13° |
| 11:00 | ✕ | 95% | 24135m | 0% | 0.4% | 18° |
| 12:00 | ✕ | 90% | 24135m | 0% | 0.4% | 22° |
| 13:00 | ✕ | 85% | 24135m | 0% | 0.4% | 24° |
| 14:00 | ✕ | 75% | 24135m | 0% | 0.4% | 25° |
| 15:00 | ✕ | 65% | 24135m | 0% | 0.4% | 24° |
| 16:00 | ✕ | 55% | 24135m | 0% | 0.2% | 21° |
| 17:00 | ✕ | 55% | 24120m | 0% | 0.2% | 17° |
| 18:00 | ✕ | 55% | 24106m | 0% | 0.2% | 12° |
| 19:00 | ✕ | 55% | 24091m | 0% | 0.2% | 6.8° |
| 20:00 | ✕ | 70% | 24106m | 0% | 0.2% | 0.94° |
| 21:00 | ✕ | 85% | 24120m | 0% | 0.2% | -4.9° |
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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