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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 manuscript called The Equatorie of the Planetis, which belongs to Peterhouse, Cambridge.  Much more about that in future posts; for now it’s enough to say that it’s a fourteenth-century instruction manual for the construction and use of a planetary equatorium, a device to compute the position of the planets. Now, I’m no DIY expert, but I pride