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Long-Term Trend of Noctilucent Cloud Altitude Detected: A Comparison of Positional Data with Historical Measurements
A large number of photometric and photographic position data of noctilucent clouds (NLC) obtained at 54-61 deg N, 29-50 deg E in 2020-2026 is used, comprising about 20,000 individual measurements of the altitude of NLC fragments recorded by a number of cameras. Comparison with published long-base tr
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