Take the ratio of these two areas
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An person on a planet orbiting the star Deneb wants to differentiate the reflected light by Earth from the light of the Sun. First, consider the area of Earth's disk which reflects the Sun's intercepted light. Second, consider the surface area of a sphere with the same radius as Earth’s orbit around the Sun. Take the ratio of these two areas. Assume the Earth's radius is 6300.0 km and is 1.2 × 108 km from the Sun.
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