also: にちうん
noun
solar halo
A ring of light around the sun caused by ice crystals in the atmosphere; a meteorological phenomenon.
今日は日暈が見えた。
A solar halo was visible today.
日暈は天気が崩れる前兆と言われる。
A solar halo is said to be a sign of approaching bad weather.
Compound of 日 (sun) and 暈 (halo). The reading ひがさ is a kun'yomi compound, while にちうん is the on'yomi reading.