Using Parallax Method get the Radius of the sun-earth orbit,(it is easily possible) provided you have trigonomtry tables.Then,assume that the sun radiates energy at 2 cal/cm2 around this whole sphere of the Earth's radial orbit with surface area of 4*pi*r*r where r is radius of sun-Earth orbit.Total Energy=2c cal/cm2*surface area and then use Stefan's law to find final answer
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