Hello, I was wondering that I'm a astronaut on Moon and I thought about a one question... If I look at the Earth (in "full moon") from the Moon, what magnitude will have the Earth? Ok, I know some typical values that the magnitude of Moon from Earth is -13 mag and the magnitude of Sun from Earth is -25 mag. However, the magnitude of Earth from Moon I don't know. Can I determine it from this values? The Pogson's equation is best for it, but how...? Thank you very much and sorry for my bad English.