Pietro Antonio Cataldi (mathematician born 1552 ad, died 1626 ) ad –Cataldi discovered sixth and seveth perfect numbers, 2 16 (2 17 – 1 )= and 2 18 ( ) = Perfect number is a positive integer that is equal to the sum of its proper positive divisors.

Willebrord Snell (mathematician born 1580 ad, died 1626 ) ad – Snell take the first attempts to measure the meridian arc of the Earth s surface, in connection with that determines her height. PublishesMathemathic Memorandum.

Claude-Gaspard Bachet de Méziriac (mathematician born 1580 ad, died 1626 ) ad – Bachet publishes his work abouth mathematical puzzles and tricks, which will be the basis for almost all later books concerning mathematical entertainments.

Pietro Antonio Cataldi describes the square roots using periodic fractions.

John Napier - (mathematician born 1550 ad, died 1617) ad –First publishes his work about logarithms „Miriffci logarithmorum cannonis descriptio”

Willebrord Snell describes the trigonometric triangulation technique, which contributes to making accurate cartographic measurements

Paul Guldin (mathematician born 1577 ad, died 1643) ad –Guldi n formulates theorem about center of gravity.

Henry Briggs (mathematician born 1561 ad, died 1630) ad –Briggs published work „ Arithmetica Logarithmica” that gives the logarithms of natural numbers from 1 to and to