His name is also recalled as the meteorological term Bouguer's halo (also known as Ulloa's halo, after Antonio de Ulloa, a Spanish member of his South American expedition) which an observer may see infrequently in fog when sun breaks through (for example, on a mountain) and looks down-sun—effectively a "Fog bow" (as opposed to a "rain-bow").
Fog bow, a rainbow produced by the tiny water droplets of fog, which has much weaker colors and can appear white
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