By John E. Westfall. When astronomers talk about the terminator, they don’t mean a murderous cyborg from the future. They mean the dividing line between day and night on a celestial body. This new atlas, by one of the world’s foremost amateur lunar observers, features high-resolution CCD images of the Moon’s terminator under 47 different illuminations. Each image, showing craters as small as 1 or 2 kilometers, is displayed at a generous scale. Accompanying text describes the major features shown in each view, and an index of 1,000 named lunar formations is cross-referenced to the images. Experienced observers will find the atlas an invaluable planning tool, while beginners will gain an understanding of lunar geography and geology. No other atlas shows the Moon under such a variety of lighting conditions.