Adriaan Vlacq

Adriaan Vlacq was a Dutch book publisher and author of mathematical tables, born in Gouda in 1600 and dying at The Hague on 8 April 1667. In 1628 he published his Arithmetica logarithmica, a table of logarithms from 1 to 100,000 to ten decimal places. It completed the earlier tables of Henry Briggs, which covered only the values 1 to 20,000 and 90,001 to 100,000, by adding 70,000 new values computed by Vlacq and Ezechiel de Decker. The table was later extended by Jurij Vega in 1794 and by Alexander John Thompson in 1952, and a shorter trigonometric table, the Canon Sinuum, appeared in later works of Vlacq. He settled in London in 1632, moved to Paris about ten years later as the English Civil War began, and finally lived in The Hague. A lunar crater is named after him.