The Chomsongdae Observatory in Kyongju, built in the period of the three kingdoms (Koguryo, Paekje and Silla), is one of the scientific achievements made by the Korean people in ancient times.

With the observatory, the Koreans observed eclipse of the sun and moon, astronomical phenomena like comet, planet, meteor and climatic change like drought and flood.

Metal type was invented in the period of Koryo, the first of its kind in the world.

The country's invention was hundreds of years earlier than Netherlands, Germany and other countries.

Many books like "Kokumsangjongrye" were published with the metal type.

A typical invention in the period of the Ri Dynasty is rain gauge.

Korea was also the first in the world to introduce a scientific method of precipitation measurement.