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Last night I saw a display of noctilucent clouds, which occur at an altitude of ~80Km above polar regions. These are only easily visible when the sun is 6 to 16 degrees below the horizon, between latitude 50 and 65 degrees. They were not recorded until 1885.
en.wikipedia.org
Noctilucent cloud - Wikipedia
- E 28-200mm F2.8-5.6 A071
- 37.0 mm
- ƒ/3.5
- 1/6 sec
- ISO 6400
