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2 unusual facts about Antonio de Ulloa


Don Antonio de Ulloa

Don Antonio de Ulloa, a Spanish Navy cruiser that fought at the Battle of Manila Bay during the Spanish-American War.

Antonio de Ulloa, a Spanish general, explorer, author, astronomer, and colonial administrator.


Pierre Bouguer

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").


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