i know it means sun and moon but i was re reading chapter 148 and itachi was using his mange sharingan too much and he said that he needed to rest at the same place for a while... then he says "not to mention until, tsukyomi becames amaterasu we should not use it..." so his little world he brough kakashi can change from night to day or something... maybe some1 can thuroughly explain this.. cuz i read it and i dont get it... thank you