From The Calendar by David Ewing Duncan, published by Fourth Estate 1999
Funny that over a year ago I decided I wanted to do a project about the 10/11 missing days in the calender, and then that I found a review for the above book stuck into an old sketchbook from 1999. Sometimes it feels like you go round in such small circles. Still, a good reminder to purchase and read it. The Calendar Index sums things up perfectly.