11. Acknowledgements

The model presented in this paper came about initially at the suggestion of Katie Birkwood, Hoyle Project Associate at the Library, St John's College, Cambridge, who wanted a model astrolabe to use in an exhibition, The Way to the Stars: Build Your Own Astrolabe, during the Cambridge Science Festival in 2010 March. I am grateful to Matthew Smith for compiling the list of saints' days shown on the reverse side of the mother.

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