A very low Sun angle emphasizes detail in this south-looking oblique view of an area in western Oceanus Procellarum. The crater Seleucus is just outside the field of view to the right, and Seleucus E is in the lower left corner. The near-terminator view was exposed in a hand-held Hasselblad camera with a 250-mm lens. Low Sun illumination enhances small surface features and subtle differences in slope so that the broad, gently sloping arches associated with the mare ridges are clearly delineated. The oblique viewing angle accentuates the angularity that characterizes the path of many ridges as they are traced across the mare surface. (See, for example, fig.68.) - M.C.M.
Report Source: NASA SP-362, Page 82, Figure 71
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Section Directory 17