I think I have already mentioned The Stones of Time by Martin Brennan to members of the list. It is worth a look for some ancient and large sundial information. It is published by Inner Traditions International, Rochester Vermont, in 1994 and still available. (ISBN 0-89281-509-4)
May I also mention a new book which I have just read and which may interest others: The Calendar, by David Ewing Duncan, published by Fourth Estate (1998) (ISBN1-85702-721-3; Price £12.99) is the story of " the 5000-year struggle to align the clock with the heavens and what happened to the missing ten days." Again well worth a look for the amateur. Paul Murphy @ 53* 17' N 06* 08' W
