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｜originally written by Asdfgh
天空同時出現3個太陽的一種奇異的光學現象，由整齊排列在空中的冰柱折射所形成，稱為「幻日」，而其出現需要嚴苛的天氣條件，不僅要有捲層雲，雲層要薄，還要有恰好的觀測角度。

References

https://www.ettoday.net/news/20201106/1848144.htm
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內蒙古通遼現「幻日」現象　天空罕見掛「3個太陽」

https://today.line.me/tw/v2/article/VK69wB?utm_source=lineshare

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