最終更新日:2022/12/24

https://books.google.com/books?id=RhboPfYELMsC&pg=PA49 page 49 Upon this true mackarel sky was depicted one of those glorious coronæ, only seen at great elevations or in high Latitudes. […] https://books.google.com/books?id=RhboPfYELMsC&pg=PA50 page 50 The corona was composed of two colours, violet on the edge nearest to the sun and red on the outer edge, the two colours blending together and forming a neutral tint in the middle of the corona; the order here observed with regard to the colours is similar to that observed in the rainbow.

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