I can recommend to diallers a book which I found by accident at our local bookshop: "The Stones of Time, Calendars, Sundials and Stone Chambers of Ancient Ireland," by Martin Brennan (Inner Traditions International, Rochester, Vermont 05767; ISBN 0-89281-509-4; pub. 1994).
It is a detailed, if not always scientifically finessed, exposition of the dialling aspects of the megalithic structures here in Ireland which are estimeated to be almost 7000 years old. The are both examples of the sophistiction of the astronomy of those who built them, and of the abstract art which they contain. Paul Murphy 53* 17' N 06* 08' W
