夜や光こう雲うんやこううんMeanings1nounnoctilucent cloudsA specific meteorological term for high-altitude clouds visible in twilight. Used in scientific and weather contexts.夏なつの夜よる、北きたの空そらに夜や光こう雲うんが見みられることがある。On summer nights, noctilucent clouds can sometimes be seen in the northern sky.
