Imagine the sun rising over a planet, like this, where O = sun, o = planet, & the character ` is a person on the planet's surface: `o O As O moves upward, ` becomes hotter. If ` moves anti-clockwise, he will stay ahead of the light from O and move into the 'night side' of o. He would be 'behind the night' and 'ahead of the sun'.
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