Earths daylight surface disk absorbs about 1045 W per m2 from the Sun. Using 6400 km for the Earths radius, how much of this radiative power is emitted by each square meter of the spherical Earth ?

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Chapter10: Earthlike Planets: Venus And Mars
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Problem 27E: Near the martian equator, temperatures at the same spot can vary from an average of 135 °C at night...
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Earths daylight surface disk absorbs about 1045 W per m2 from the Sun. Using 6400 km for the Earths radius, how much of this radiative power is emitted by each square meter of the spherical Earth ? 

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