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The shadow effect, together with the global curvature of the Moon, also play trick to the appearance of lunar mountains. In the right figure which shows the telescope view of Mons Piton, an isolated mountain in Map 15|, it has the appearance of a steep cliff, exaggerated by the long triangular shadow under low illumination. However, an astronaut on the Moon would find its slope quite gradual, roughly 200. This is because the global curvature of the Moon is greater than that of the Earth; the short horizon distance of the astronaut (2.5 km) makes him or her to perceive Mons Piton not as steep as the shadowed view in telescopes.

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