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Rule Dark Skies

Saas-Fee - Dark Skies - Alps

Saas-Fee, Valais, Switzerland

Moonless nights with crystal-clear skies for deep-sky photography

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Pristine Dark Skies (pristine)
Saas-Fee
Sat, Apr 25 · 03:00–04:28 · 1h window
Low confidence
36%
🌛Moon Altitude-1.2-8.3°
☁️Total Cloud Coverage2.8-3.9%

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 95 hoursJump to next match
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Europe/Zurich
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, Apr 20
21:00✕48%24135m0%12%35°
22:00✓40%24134m0%12%25°
23:00✓9.6%24134m0%12%16°
Tue, Apr 21
24:00✓8.7%24135m0%12%7.3°
01:00✓23%24134m0%12%-0.47°
02:00✓35%24134m0%21%-7°
03:00✓24%24135m0%21%-12°
04:00✓19%24135m0%21%-15°
05:00✕15%24134m0%21%-16°
06:00✕12%24135m27%21%-14°
07:00✕21%24134m55%21%-11°
08:00✕16%24135m82%21%-5.3°
09:00✕39%24134m88%21%1.6°
10:00✕47%24135m94%21%9.6°
11:00✕52%20272m100%21%19°
12:00✕81%11510m100%21%28°
13:00✕91%11391m100%21%38°
14:00✕95%12384m100%21%48°
15:00✕87%9773m96%21%57°
16:00✕46%20076m88%21%66°
17:00✕29%24134m82%21%71°
18:00✕20%20085m85%21%71°
19:00✕15%17576m89%21%65°
20:00✕10%18000m93%21%56°
21:00✕20%10786m80%21%46°
22:00✓22%23087m68%21%36°
23:00✓30%22243m56%21%26°
Wed, Apr 22
24:00✓14%24134m66%21%17°
01:00✓31%19833m75%21%8°
02:00✓27%8352m85%32%0.1°
03:00✓34%10815m82%32%-6.6°
04:00✓43%4587m79%32%-12°
05:00✕63%4192m77%32%-15°
06:00✕68%3083m79%32%-16°
07:00✕96%153m81%32%-15°
08:00✕96%122m83%32%-12°
09:00✕96%135m83%32%-6.3°
10:00✕96%109m82%32%0.46°
11:00✕95%155m82%32%8.5°
12:00✕88%165m85%32%17°
13:00✕96%107m88%32%27°
14:00✕95%101m92%32%37°
15:00✕96%87m68%32%47°
16:00✕95%47m45%32%56°
17:00✕95%625m22%32%65°
18:00✕96%3027m31%32%70°
19:00✕96%8694m41%32%70°
20:00✕90%9602m50%32%64°
21:00✕78%9636m33%32%55°
22:00✓74%4535m17%32%46°
23:00✓62%4537m0%32%35°
Thu, Apr 23
24:00✓33%11863m0%32%26°
01:00✓29%12330m0%32%16°
02:00✓29%11641m0%43%6.9°
03:00✓31%14804m0%43%-1.3°
04:00✓32%24135m0%43%-8.3°
05:00✕12%24135m0%43%-14°
06:00✕1.7%24135m0%43%-17°
07:00✕1.7%24135m0%43%-19°
08:00✕0.3%24135m0%43%-17°
09:00✕0.1%24135m0%43%-14°
10:00✕0.1%24134m0%43%-8.7°
11:00✕1.2%24135m0%43%-1.8°
12:00✕1.2%24135m0%43%6.4°
13:00✕0.1%24135m0%43%15°
14:00✕0.2%24134m0%43%25°
15:00✕0.2%24135m0%43%35°
16:00✕0.1%24135m0%43%45°
17:00✕2.1%24134m0%43%54°
18:00✕0%24135m0%43%62°
19:00✕0%24134m0%43%67°
20:00✕0%24134m0%43%66°
21:00✕0.2%24134m0%43%61°
22:00✓0.2%24134m0%43%53°
23:00✓0.2%24134m0%43%43°
Fri, Apr 24
24:00✓0.2%24135m0%43%33°
01:00✓0.2%24135m0%43%23°
02:00✓3.3%24135m0%54%13°
03:00✓24%24135m0%54%3.7°
04:00✓44%24135m0%54%-4.7°
05:00✕64%24135m0%54%-12°
06:00✕45%24135m0%54%-18°
07:00✕27%24135m0%54%-21°
08:00✕7.6%24135m0%54%-23°
09:00✕31%24135m0%54%-21°
10:00✕55%24135m0%54%-18°
11:00✕78%24135m0%54%-12°
12:00✕57%24135m0%54%-4.6°
13:00✕36%24135m0%54%3.9°
14:00✕15%24135m0%54%13°
15:00✕11%24135m0%54%23°
16:00✕8.2%24135m0%54%33°
17:00✕5%24135m0%54%42°
18:00✕5%24135m0%54%51°
19:00✕5%24135m0%54%59°
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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