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"Zero Phase"
Pete was standing with his back to the Sun, facing the 'down-Sun' or
Zero-Phase direction. With the Sun 7.7 degrees above the eastern
horizon, Pete's shadow is about 15 meters long.
The area beyond the tip of Pete's shadow is bright and looks
washed-up. Reflections off the small, broken fragments of rock
that make up the surface layer are particularly strong directly back
toward the Sun, making the surface at Zero Phase particularly
bright. In addition, any rock farther away than the tip of Pete's
shadow will hide its own shadow. The two effects make it all but
impossible to see detail at Zero Phase.
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