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I’ve written a blog post entitled “How to cast a medieval horoscope” before.  But I didn’t tell the whole story. Regular readers of this blog (are there any?) will know that the main focus of my research is equatoria – devices designed to compute the positions of the Sun, Moon and planets.  I’ve made and used two of them – three if you count the fully functional virtual model which I helped create (though I can’t claim much of the credit – that goes to the amazing Ben Blundel