A pamphlet on calculating the date of Easter:
Pell was a reticent man and it's characteristic of him that this little pamphlet is an anonymous work. Apparently it was popularly believed that Easter in 1664 should have fallen on April 3 rather than April 10. Though it's written in answer to a query, it may have been commissioned by an acquaintance, bishop Gilbert Sheldon. See Noel Malcolm and Jacqueline Stedall, John Pell (1611-1685) and his correspondence with Sir Charles Cavendish (Oxford UP, 2005) 186.)
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