# Chronology for 1600 to 1625 1603
Cataldi finds the sixth and seventh perfect numbers, 216(217 - 1) =8589869056 and 218(219 - 1) = 137438691328.

1603
Accademia dei Lincei founded in Rome.

1606
Snell makes the first attempt to measure a degree of the meridian arc on the Earth's surface, and so determine the size of the Earth. He publishes Hypomnemata mathematica (Mathematical Memoranda) which is a Latin translation of Stevin's work on mechanics.

1609
Kepler publishes Astronomia nova (New Astronomy). The work contains Kepler's first and second law on elliptical orbits, but only verified for the planet Mars.

1610
Galileo publishes Sidereus Nuncius (Message from the stars) which describes the astronomical discoveries he has made with his telescopes. Harriot also observes the moons of Jupiter but does not publish his work.

1612
Bachet publishes a work on mathematical puzzles and tricks which will form the basis for almost all later books on mathematical recreations. He devises a method of constructing magic squares.

1613
Cataldi publishes Trattato del modo brevissimo di trovar la radice quadra delli numeri in which he finds square roots using continued fractions.

1614
Napier publishes his work on logarithms in Mirifici logarithmorum canonis descriptio (Description of the Marvellous Rule of Logarithms).

1615
Kepler publishes Nova stereometria doliorum vinarorum (Solid Geometry of a Wine Barrel), an investigation of the capacity of casks, surface areas, and conic sections. He first had the idea at his marriage celebrations in 1613. His methods are early uses of the calculus.

1615
Mersenne encourages mathematicians to study the cycloid. (See this Famous curve.)

1617
Snell publishes his technique of trigonometrical triangulation which improves the accuracy of cartographic measurements.

1617
Briggs publishes Logarithmorum chilias prima (Logarithms of Numbers from 1 to 1,000) which introduces logarithms to the base 10.

1617
Napier invents Napier's bones, consisting of numbered sticks, as a mechanical calculator. He explains their function in Rabdologiae (Study of Divining Rods) published in the year of his death.

1620
Bürgi publishes Arithmetische und geometrische progress-tabulen which contains his version of logarithms discovered independently of Napier.

1620
Gunter makes a mechanical device, Gunter's scale, to multiply numbers based on logarithms using a single scale and a pair of dividers.

1620
Guldin gives Guldin's Centroid Theorem which was already known to Pappus.

1621
Bachet publishes his Latin translation of Diophantus's Greek text Arithmetica.

1623
Schickard makes a "mechanical clock", a wooden calculating machine that add and subtract and aid with multiplication and division. He writes to Kepler suggesting using mechanical means to calculate ephemeredes.

1624
Briggs publishes Arithmetica logarithmica (The Arithmetic of Logarithms) which introduces the terms "mantissa" and "characteristic". It gives the logarithms of the natural numbers from 1 to 20,000 and 90,000 to 100,000 computed to 14 decimal places as well as tables of the sine function to 15 decimal places, and the tangent and secant functions to 10 decimal places.

List of mathematicians alive in 1600.

List of mathematicians alive in 1625. JOC/EFR May 2015 The URL of this page is: School of  Mathematics and Statistics University of  St Andrews, Scotland https://www-history.mcs.st-andrews.ac.uk/history/Chronology/1600_1625.html
{"ft_lang_label":"__label__en","ft_lang_prob":0.8816973,"math_prob":0.5640929,"size":3421,"snap":"2019-13-2019-22","text_gpt3_token_len":820,"char_repetition_ratio":0.123207495,"word_repetition_ratio":0.0,"special_character_ratio":0.21397252,"punctuation_ratio":0.09154929,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.979308,"pos_list":[0,1,2,3,4,5,6],"im_url_duplicate_count":[null,null,null,null,null,7,null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2019-05-24T07:04:24Z\",\"WARC-Record-ID\":\"<urn:uuid:a7199575-7103-4c70-a2e3-744fbc0d82b6>\",\"Content-Length\":\"19083\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:4ea99476-4648-4ba4-9a6f-947cb4b723ca>\",\"WARC-Concurrent-To\":\"<urn:uuid:fa963da9-f3eb-40f9-bd57-e8a1c3580d71>\",\"WARC-IP-Address\":\"138.251.192.92\",\"WARC-Target-URI\":\"http://www-history.mcs.st-andrews.ac.uk/Chronology/1600_1625.html\",\"WARC-Payload-Digest\":\"sha1:VVBUQ2LPDFG5STODK6AQAS2R7TQ3NXKT\",\"WARC-Block-Digest\":\"sha1:2722KU5YQHIKRWJHTF65HXYGEUIAOQOR\",\"WARC-Identified-Payload-Type\":\"text/html\",\"warc_filename\":\"/cc_download/warc_2019/CC-MAIN-2019-22/CC-MAIN-2019-22_segments_1558232257553.63_warc_CC-MAIN-20190524064354-20190524090354-00111.warc.gz\"}"}