In 1748, Spanish explorer Antonio de Ulloa (1716ò??1795) and six other travelers each observed a colorful atmospheric phenomenon around their distorted shadows on a thin cloud in the distance. As French astronomer and science popularizer Camille Flammarion explained in his 1872 book,
Lò??AtmosphÓ?re (ò??The Atmosphereò??): ò??The image was in the centre of three rainbows of different colors, and surrounded at a certain distance by a fourth bow with only one color. ò?? All these bows were perpendicular to the horizon; they moved in the direction of, and followed, the image of the person whom they enveloped as with a glory.ò??
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