First I talked about the connection of dinosaurs and the Korean history. There are 4 eras in the history. They are Precambrian Era, Palezoic Era, Mezoic Era, and the Cenozoic Era, and the dinosaurs were usually in Mezoic Era. In Korea, there are dinosaur footprints in Çس² and °íâ.

 Second, I learned about the connection of stars and the Korean history. There are many stars and constellations in the universe. There is a map of constellations, astronomical chart in Korea. It is õ»ó¿­Â÷ ºÐ¾ßÁöµµ which was made in the Á¶¼± dynasty. Á¶¼± people didn't have any machine, but they made an astronomical chart. Instead they had ÷¼º´ë and watched the constellations there. Astronomy was important to Korean history, because in Korea, agriculture was main industry. And in agriculture, weather which was involved in astronomy was important.