Thank you! Party this evening at my place. It's fine to say "the earth behaves similarly to a black-body" or "a black-body is a good approximation for the eart

Thank you! Party this evening at my place. It's fine to say "the earth behaves similarly to a black-body" or "a black-body is a good approximation for the earth". But that's different from "the earth is a black-body".