iiinova — where your digital self keeps evolving

Thony Christie @rmathematicus.bsky.social · 07/10/2026

Infinite series in medieval India the Kerala school of astronomy and mathematics #histsci thonyc.wordpress.com/2026/10/07/t...

Map of India showing the State of Kerala

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Thony Christie @rmathematicus.bsky.social · 01/10/2026

Book Review: thonyc.wordpress.com/2026/10/01/v...

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Thony Christie @rmathematicus.bsky.social · 16/09/2026

The history of the proportional compass an early analogue calculator #histsci #histtech thonyc.wordpress.com/2026/09/16/t...

A brass proportional compass made by Galileo c. 1604

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Thony Christie @rmathematicus.bsky.social · 13/08/2026

Oughtred vs. Delamain: Priority a Plagiarism: Who invented the circular slide rule? #histsci #histtech thonyc.wordpress.com/2026/08/13/o...

Oughtred’s circular slide rule with sundial on reverse, Elias Allen, London, c. 1633-1640

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Thony Christie @rmathematicus.bsky.social · 23/07/2026

Book Review: Reading the Mind of God: Johannes Kepler and the Reform of Astronomy #histsci thonyc.wordpress.com/2026/07/23/r...

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Thony Christie @rmathematicus.bsky.social · 13/07/2026

16th century, leading, English, mathematicus John Dee was born 13 July 1527 #histsci thonyc.wordpress.com/2024/07/24/j...

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Thony Christie @rmathematicus.bsky.social · 02/07/2026

Jesuit mathematician & astronomer, Christoph Grienberger, inventor of the heliotropic telescope, was born 2 July 1561 #histsci #histtech thonyc.wordpress.com/2021/07/07/t...

Heliotropic telescope on the left. On the right Scheiner’s acknowledgement that Grienberger was the inventor

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Thony Christie @rmathematicus.bsky.social · 29/06/2026

Flemish physician and botanist Rembert Dodoens, whose Cruydeboeck (1554) was plagiarised by John Gerrard to become the dominant Renaissance English Herbal, was born 29 June 1517 #histsci thonyc.wordpress.com/2010/06/29/o...

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Thony Christie @rmathematicus.bsky.social · 19/06/2026

17th century French physicist Blaise Pascal was born 19 June 1623 #histsci thonyc.wordpress.com/2025/10/01/f...

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Thony Christie @rmathematicus.bsky.social · 11/06/2026

On this day seventeen years ago, the Renaissance Mathematicus took its first faltering step in the Internet thonyc.wordpress.com/2026/06/11/17/

The heptadecagon, the regular seventeen sided polygon

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Thony Christie @rmathematicus.bsky.social · 30/05/2026

Renaissance, Austrian astronomer, mathematician , Georg von Peuerbach, was born 30 May, 1423. #histsci thonyc.wordpress.com/2011/05/30/t...

Cover of Peuerbach's Theoricarum novarum planetarum (New Planetary Theory) the first ever printed maths book

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Thony Christie @rmathematicus.bsky.social · 28/05/2026

Book Review: The Board of Longitude: Science Innovation and Empire, (CUP, 2025) thonyc.wordpress.com/2026/05/28/t...

Book cover of The Board of Longitude: Science, Innovation and Empire

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Thony Christie @rmathematicus.bsky.social · 26/05/2026

Huguenot mathematician, Abraham De Moivre, was born 26 May 1667 #histsci thonyc.wordpress.com/2018/10/24/a...

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Thony Christie @rmathematicus.bsky.social · 21/05/2026

The Renaissance Artist, Albrecht Dürer, who wrote a maths book the first to be printed and published in German, was born 21 May 1471 #histsci thonyc.wordpress.com/2011/05/21/a...

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Thony Christie @rmathematicus.bsky.social · 20/05/2026

Ibn al–Haytham did not invent the scientific method #histsci thonyc.wordpress.com/2026/05/20/i...

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Thony Christie @rmathematicus.bsky.social · 15/05/2026

Teaching practical mathematics in 17th-century England thonyc.wordpress.com/2026/05/15/a...

The title page of John Speidell's A Geometricall Extraction

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Thony Christie @rmathematicus.bsky.social · 06/05/2026

Al-Khwarizmi did not in anyway originate, invent, or create the algorithm thonyc.wordpress.com/2026/05/06/a...

A Russian postal stamp with a portrait of al-Khwarizmi

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Thony Christie @rmathematicus.bsky.social · 01/05/2026

Joseph Moxon wrote, printed and published the first ever accurate and detailed account of the techniques and methods of printing 1683-84 #histtech thonyc.wordpress.com/2026/05/01/j...

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Thony Christie @rmathematicus.bsky.social · 15/04/2026

Book Review: thonyc.wordpress.com/2026/04/15/a...

Cover of Builder of Heavens: How Eise Eisinga Created the Greatest Planetarium of his Time

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Thony Christie @rmathematicus.bsky.social · 08/04/2026

Newton vs. Descartes:- Newton's Principia its reception & the eventual victory of Principia Mathematica over Principia Philosophiae #histsci thonyc.wordpress.com/2026/04/08/f...

Newton's own copy of the 1st edition of Principia with his annotations

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Thony Christie @rmathematicus.bsky.social · 02/04/2026

Henry Frederick Stuart (1594–1612) eldest son of James VI of Scotland, I of England & Anne of Denmark, heir apparent to the thrones of Scotland & England engaged several of the leading mathematical practitioners of the age at his court as tutors #histsci thonyc.wordpress.com/2026/04/02/t...

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Thony Christie @rmathematicus.bsky.social · 26/03/2026

The evolution of Newton's mechanics from De motu (1684) to Principia (1687) #histsci thonyc.wordpress.com/2026/03/26/f...

Portrait of Isaac Newton by Godfrey Kneller 1689

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Thony Christie @rmathematicus.bsky.social · 20/03/2026

Not so much a book review as a book extermination! #histsci thonyc.wordpress.com/2026/03/20/h...

Cover of Violet Moller's "Inside the Stargazer's Palace."

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Thony Christie @rmathematicus.bsky.social · 25/02/2026

Englands first printed-globe maker. Emery Molyneux #histsci #histtech thonyc.wordpress.com/2026/02/25/e...

Emery Molyneux's first printed terrestrial globe

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Thony Christie @rmathematicus.bsky.social · 16/02/2026

Georg Joachim Rheticus, who travelled to Copernicus in Frombork and took the manuscript of De revolutionibus to Johannes Petreius in Nürnberg to be published, was born 16 February 1514 #histsci thonyc.wordpress.com/2012/02/16/m...

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Thony Christie @rmathematicus.bsky.social · 15/02/2026

Galileo Galilei was born 15 February 1568, it's more than 15 years since my infamous deflation of his bloated reputation #histsci thonyc.wordpress.com/2010/06/02/e...

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Thony Christie @rmathematicus.bsky.social · 10/02/2026

Book Review Jerry Brotton's Four Points of the Compass thonyc.wordpress.com/2026/02/10/c...

Cover of Jerry Brotton' Four Points of the Compass

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Thony Christie @rmathematicus.bsky.social · 28/01/2026

Isaac Newton "the phenomenon of colour" and his reflecting telescope #histsci thonyc.wordpress.com/2026/01/28/f...

A drawing of the reflecting telescope that Newton presented to the Royal Society

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Thony Christie @rmathematicus.bsky.social · 28/01/2026

Giovanni Alfonso Borelli the mathematician who applied mechanics to anatomy was born 28 January 1608 #histsci thonyc.wordpress.com/2025/06/19/f...

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Thony Christie @rmathematicus.bsky.social · 21/01/2026

Probably the most well-known perspectograph is that of Albrecht Dürer

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Thony Christie @rmathematicus.bsky.social · 21/01/2026

The scientific instrument maker Ralph Greatorex and his connections in the mid 17th century English mathematical and scientific community. #histsci #histtech thonyc.wordpress.com/2026/01/21/t...

Perspectograph made by Ralph Greatorex for Christopher Wren

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Thony Christie @rmathematicus.bsky.social · 14/01/2026

Isaac Newton the path from farm boy to Cambridge graduate #histsci thonyc.wordpress.com/2026/01/14/f...

Sir Isaac Newton. when Bachelor of Arts in Trinity College, Cambridge. Engraved by B. Reading from a Head painted by Sir Peter Lily in the Possession of the Right Honorable Lord Viscount Cremorne.

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Thony Christie @rmathematicus.bsky.social · 09/01/2026

Book Review: The Origin and Significance of Zero: An interdisciplinary Perspective #histsci thonyc.wordpress.com/2026/01/09/m...

Cover of "The Origin and Significance of Zero"

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Thony Christie @rmathematicus.bsky.social · 31/12/2025

Isaac Barrow & John Wallis introduced the young Isaac Newton to the concept of mathematical physics and the new continental mathematics #histsci thonyc.wordpress.com/2025/12/31/f...

Portrait of John Wallis by Godfrey Kneller

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Thony Christie @rmathematicus.bsky.social · 27/12/2025

There are very few surviving portrait of Johannes Kepler and each of them has a question mark hanging over it for some reason #histsci thonyc.wordpress.com/2025/12/27/c...

An engraving of a portrait of Johannes Kepler from a 1620 painting that was given to the Strasbourg Library in 1627, artist unknown.

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Thony Christie @rmathematicus.bsky.social · 14/12/2025

Tycho Brahe born 14 December 1546, built his Uraniborg, the first custom-built observatory in modern Europe on the island of Hven. It cost a fortune, how was it financed and why? #histsci #histtech thonyc.wordpress.com/2014/10/30/f... Brahe's Uraniborg main building from Blaeu's Atlas Maior (1663)

Tycho Brahe's Uraniborg main building from Blaeu's Atlas Maior (1663)

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Thony Christie @rmathematicus.bsky.social · 03/12/2025

Book Review: Nuno Castel-Branco’s "The Traveling Anatomist: Nicolaus Steno and the Intersection of Disciplines in Early Modern Science" #histsci thonyc.wordpress.com/2025/12/03/t...

Front cover of Castel-Branco's book showing sketch of Great White Shark head dissected by Steno in Florence

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Thony Christie @rmathematicus.bsky.social · 01/12/2025

Logician, psychologist and expert for colour vision, Christine Ladd Franklin, who fought against prejudice against women in academia her whole life, was born 1 December 1847 #histsci thonyc.wordpress.com/2017/10/10/a... B/W

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Thony Christie @rmathematicus.bsky.social · 26/11/2025

The rise of the scientific societies to discuss the new developments in natural philosophy in the 17th century #histsci thonyc.wordpress.com/2025/11/26/f...

A suitably regal first Royal Society President, portrait of William Brouncker, 2nd Viscount Brouncker after Peter Lely

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Thony Christie @rmathematicus.bsky.social · 19/11/2025

Elias Allen: The leading scientific instrument maker in seventeenth-century London #histsci #histtech thonyc.wordpress.com/2025/11/19/t...

Engraved portrait of Elias Allen by Wenceslas Hollar surrounded by his tools and the instruments he made

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Thony Christie @rmathematicus.bsky.social · 13/11/2025

A truly excellent book, highly recommended thonyc.wordpress.com/2023/09/20/s...

Cover of Katy Barrett's book "Looking for Longitude"

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Thony Christie @rmathematicus.bsky.social · 12/11/2025

Christiaan Huygens' & his wave theory of light #histsci thonyc.wordpress.com/2025/11/12/f...

Portrait of Christiaan Huygens by Bernard Vaillant (1686)

Diagram of light waves emanating from a candle

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Thony Christie @rmathematicus.bsky.social · 25/10/2025

Written before I got ill but never posted: Three more books on the history of medieval Islamicate culture #histsci thonyc.wordpress.com/2025/10/25/t...

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Thony Christie @rmathematicus.bsky.social · 01/10/2025

Blaise Pascal, Torricellian tubes, the vacuum & air pressure #histsci #histtech thonyc.wordpress.com/2025/10/01/f...

Portrait of Blaise Pascal artist unknown

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