Any armchair navigator or scientist who was captivated by Dava Sobel's bestselling but brief 1995 book, Longitude, can wallow at length in the subject with this comprehensive volume based on a 1993 symposium (which was also the origin of Sobel's book). The historical, scientific, and technological aspects of what editor Andrewes (curator of Harvard's Collection of Historical Scientific Instruments) calls ``the longitude problem'' are examined in detail. Attractively designed, this large volume is lavishly illustrated in both color and black-and-white.