deaths
Willebrord Snell, Dutch astronomer and mathematician (born 1580)
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Willebrord Snellius
Dutch astronomer and mathematician (1580-1626)
Willebrord Snellius (born Willebrord Snel van Royen, commonly known simply as Snellius and Snell, was a Dutch astronomer and mathematician.Source: Wikipedia (CC BY-SA)