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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%
starry-night weather icon
Good Dark Skies at Sunrise
Girdwood
Tue, Mar 10 · 08:00–09:00
🌛Moon Altitude:1.3°
Low
starry-night weather icon
Good Dark Skies
Girdwood
Tue, Mar 10 · 12:00–14:00
🌛Moon Altitude:-20.2--13.9°
Low
starry-night weather icon
Good Dark Skies
Girdwood
Tue, Mar 10 · 19:00–21:00
🌛Moon Altitude:-57.1--56.2°
Low
starry-night weather icon
Pristine Dark Skies (pristine)
Girdwood
Wed, Mar 11 · 24:00–07:00
🌛Moon Altitude:-38.3--3°
Low
starry-night weather icon
Pristine Dark Skies (pristine) at Sunrise
Girdwood
Wed, Mar 11 · 07:00–09:00
🌛Moon Altitude:-0.4-0.6°
Low
starry-night weather icon
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 hour
7matching hours in the next 95 hoursJump to next match
OR 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
16:0014%24134m0%99%-20°
17:007.5%24134m0%99%-15°
18:004.6%24135m0%99%-9.2°
19:000.3%24134m0%99%-2.6°
20:000.6%24134m0%99%4.2°
21:000.6%24134m0%99%11°
22:000.1%24135m0%99%17°
23:000%24135m0%99%23°
Wed, Mar 4
24:000%24134m0%99%27°
01:002.4%24135m0%99%29°
02:002.4%24134m0%99%29°
03:003%24134m0%99%28°
04:0040%24134m0%99%24°
05:0046%24134m0%99%19°
06:0038%24135m0%99%13°
07:004.7%24135m0%99%6.2°
08:004.3%24135m0%99%-1.1°
09:002.5%24135m0%99%-8.3°
10:002.5%24135m0%99%-15°
11:000.1%24134m0%99%-21°
12:000%24134m0%99%-27°
13:000%24135m13%99%-30°
14:000%24135m26%99%-32°
15:000%24134m39%96%-31°
16:000%24135m49%96%-29°
17:002.6%24134m60%96%-25°
18:002.9%24134m70%96%-19°
19:0015%24134m74%96%-13°
20:0021%23285m78%96%-6.3°
21:0040%22977m82%96%0.53°
22:0059%10683m82%96%7.1°
23:0055%6359m82%96%13°
Thu, Mar 5
24:0099%5362m82%96%18°
01:00100%5027m82%96%21°
02:00100%5163m82%96%23°
03:00100%5058m82%96%23°
04:00100%4276m67%96%21°
05:00100%5277m53%96%17°
06:00100%6546m39%96%12°
07:00100%6094m53%96%5.5°
08:00100%1555m67%96%-1.4°
09:00100%775m82%96%-8.6°
10:00100%549m67%96%-16°
11:00100%1560m53%96%-23°
12:00100%4481m39%96%-29°
13:00100%6608m49%96%-34°
14:00100%8305m59%96%-37°
15:0099%6695m69%90%-38°
16:0081%9369m70%90%-37°
17:0096%6125m72%90%-34°
18:00100%4773m74%90%-29°
19:00100%1720m80%90%-23°
20:00100%828m87%90%-16°
21:00100%4232m93%90%-9.6°
22:00100%5700m93%90%-2.8°
23:00100%1190m94%90%3.4°
Fri, Mar 6
24:00100%241m94%90%8.9°
01:00100%336m96%90%13°
02:00100%587m98%90%16°
03:00100%1437m99%90%17°
04:00100%1053m99%90%17°
05:00100%810m99%90%14°
06:00100%207m99%90%10°
07:00100%276m99%90%4.7°
08:00100%428m100%90%-1.6°
09:00100%334m100%90%-8.5°
10:00100%359m98%90%-16°
11:0094%642m97%90%-23°
12:0087%584m95%90%-30°
13:0072%4018m96%90%-36°
14:00100%1976m98%90%-40°
15:0098%1814m99%84%-43°
16:00100%809m97%84%-44°
17:00100%92m95%84%-42°
18:00100%67m93%84%-38°
19:00100%57m95%84%-32°
20:00100%56m97%84%-26°
21:00100%87m99%84%-19°
22:0099%120m97%84%-12°
23:0098%152m95%84%-5.9°
Sat, Mar 7
24:0097%185m93%84%0.11°
01:0098%470m95%84%5.2°
02:0099%755m96%84%
03:00100%1040m98%84%11°
04:00100%729m93%84%12°
05:00100%419m89%84%11°
06:00100%108m85%84%
07:00100%152m86%84%3.8°
08:00100%196m88%84%-1.6°
09:00100%240m90%84%-7.9°
10:00100%6232m91%84%-15°
11:00100%12224m92%84%-22°
12:00100%18215m93%84%-29°
13:0096%16617m92%84%-36°
14:0092%15019m91%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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