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Following Kepler

Tracing the history of medieval astronomy

Category: Astronomy Before the Telescope

Posted on April 26, 2026

Chaucer’s Use of Astronomy in the Canterbury Tales

This video is an adaptation of one of my more recent SCA classes. It was prepared for a Canterbury Tales themed event last September, but I’d held off on converting it into a video, because I thought it would be appropriate to release the video on April 18th: The date of the pilgrimage Chaucer gives. Unfortunately, a bunch of real life got in the way…

Posted on April 6, 2026April 26, 2026

Astronomy in Germany

Last month, I visited Germany for a conference on medieval Islamic astrolabes. Unfortunately, that was not particularly suitable for a video on my channel (as it was too deep in the weeds). But, if I was already heading across an ocean, I decided to take some additional time to visit some of Germany’s other astronomical locations.

Continue reading “Astronomy in Germany”

Posted on March 13, 2026

Astronomy & Power

Posted on January 29, 2026

Understanding Ptolemy’s Almagest: Book V

Posted on December 2, 2025

How I Spent My Italian Vacation

Posted on November 20, 2025

Sicily’s Golden Age of Astronomy

My second video from my trip to Italy.

Posted on November 15, 2025

Ingazio Danti and the Gregorian Calendar Reform

Sorry for the slow posting. I was gone for half of October and the first week of November. Why?

I was on a European adventure to Italy and Greece. Part honeymoon, part collecting material for some new videos. Here’s the first of them!

Posted on August 8, 2025

Instrumentum Primi Mobilis – A Medieval Calculator

I’m really excited to post this video. It is the culmination of a lot of work. Not just research, but also in producing the instrument, translating, and visiting the Linda Hall Library to work with the original source material.

 

Posted on April 14, 2025

Understanding Ptolemy’s Almagest: Books I & II

I’m finally getting to some videos on the Almagest. So I suppose I need to get back to working on it, so I’m finished with it before the videos catch up…

Posted on March 19, 2025

The Real History Behnind “Orb: On the Movements of the Earth”

Did you know that Netflix has an entire anime series on medieval astronomy?

Of course I reviewed it.

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Almagest
85%

De Revolutionibus
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Astronomia Nova
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Important Posts

  • Almagest: Index
  • History of Ptolemy’s Star Catalog: Index
  • Star Catalog Manuscripts Index
  • My Library
  • Class Schedule
  • Class Materials
  • Spinoff Project Ideas

Other Pre-Telescopic Astronomy Websites

  • The Astrolabe Project
  • The Renaissance Mathematicus

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