1. The problem statement, all variables and given/known data The temperature at the surface of the Sun is approximately 5 700 K, and the temperature at the surface of the Earth is approximately 290 K. What entropy change occurs when 1 000 J of energy is transferred by radiation from the Sun to the Earth? 2. Relevant equations 3. The attempt at a solution So I know how to solve this problem. My question is more about the sign than about the calculation. I left my answer of ΔS as negative, but the book lists it as positive. It seems to me like the change should be negative because the T is cooler on earth hence entropy should decrease within this closed system.