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What do all those columns of letters and numbers mean? This post explains how to make sense of all the information.

Since today is 29th February, a leap-year-themed post is in order.  This one answers the question you’ve all been asking: how are leap...

A few years ago I enjoyed a blog post in which National Maritime Museum curator Rebekah Higgitt wrote about the “navigation” theme of the...

Apologies for the long hiatus!  I’ve been busy with lots of things, among them the birth of my first child.  I’ll post his horoscope here...

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

This is a question I’ve been asked several times, and it’s a reasonable one given that this blog is called “Astrolabes and Stuff”, yet...

With a free weekend, and fine autumn weather forecast, it seemed a good time to try making my own planetary equatorium. I’m studying a...