Blog

Seb Falk

Jun 9, 20145 min

Launch of the Digital Equatorium

I wrote this post for the Peterhouse Perne and Ward Libraries blog. It is cross-posted from there with their kind permission. 28 May saw...

Seb Falk

Jun 20, 20134 min

How to cast a medieval horoscope

I wrote this post for the blog of the 24th International Congress of History of Science, Technology and Medicine (iCHSTM), which takes...

Seb Falk

Jun 10, 20133 min

Making a brass equatorium

I’m flying to Chicago on Wednesday. There’ll be an unusual object in my luggage (is it wise to put that kind of statement online?). ...

Seb Falk

Nov 26, 20124 min

Mercury’s meandering deferent

This week I’m back with my equatorium, trying to pin down precisely how well it models Ptolemy’s planetary theories (and, in turn,...

Seb Falk

Nov 6, 20124 min

Medieval Craftsmanship, Part 2

In my first post I described how I began making an equatorium according to the instructions in the fourteenth-century manuscript I’m...