A calculation performed in 1585 allowed Adriaen Anthonisz to define the ratio of a circle's circumference to its diameter as the fraction 355/113. This specific mathematical constant, later known as pi, secured his place in the historical development of algebra within the Dutch Republic, providing a durable result that persisted long after his work concluded.
Professional Versatility in Alkmaar
Born in 1543 in Alkmaar, Anthonisz maintained a multifaceted career throughout his life in the Netherlands. He operated as a mathematician, surveyor, cartographer, and map drawer. His expertise extended into the political sphere, where he served as an alderman, deputy, and member of a vroedschap. By 1582, he attained the position of burgomaster, serving as the mayor of his home city.
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Anthonisz gained professional standing as one of the early military engineers to implement the standards of the Dutch fortification system. His technical projects included the expansion and fortification of Naarden and Muiden. Furthermore, he applied his surveying skills to the regional geography, including the detailed mapping of the Berger lake.
Mathematical Legacy and Family
The approximation of 355/113 for the ratio of a circle's circumference to its diameter, famously termed Metius's number, was published by his son, Adriaan Metius. Anthonisz had two sons, both named Metius, a name derived from the Dutch word for measuring or surveyor. Adriaan Metius became a geometer and astronomer, while his brother Jacob Metius established a reputation as an instrument-maker and lens grinder, notably seeking a patent for the telescope.
Fast facts
- Born: 1543, Alkmaar
- Died: 1620, Alkmaar
- Citizenship: Dutch Republic
- Occupations: Mathematician, surveyor, politician, military engineer
- Notable result: 355/113 as an approximation of pi
- Positions held: Mayor of Alkmaar, alderman, deputy
Questions readers ask
What is the origin of the term Metius's number?
It refers to the value 355/113, which Anthonisz calculated for pi and his son, Adriaan Metius, later published.
What major infrastructure projects did Anthonisz undertake?
He expanded and fortified the towns of Naarden and Muiden and mapped the Berger lake.
