didn't time dilation concept known before einstein relativity theory??? there were ancient story saying that time runs differently on different planes of existence. i will relate one of ancient hindu mythology in which time dilation was referred. Story of King Kakudmi and his lovely daughter Revathi. Revati was the only daughter of King Kakudmi. Feeling that no human could prove to be good enough to marry his lovely and talented daughter, King Kakudmi took Revati with him to Lord Brahma place to ask Lord Brahma's advice about finding a suitable husband for Revati. When they arrived, Lord Brahma. Lord Brahma laughed loudly, and explained that time runs differently on different planes of existence,and that during the short time many generation had passed on Earth. (http://en.wikipedia.org/wiki/Revati) There were other time dilation story in other cultures also referred in the same site.