Koguryo people observed solar eclipse, lunar eclipse, and planet and comet motions and recorded them on a stone.

The chart provided assistance to getting the astronomical theory and knowledge and data necessary for astronomical observation and to making calendar.

According to "Haedong Miscellany", a book of the Ri Dynasty (1392-1910), the chart was kept in the walled city of Pyongyang but it was lost in the closing years of Koguryo when foreign aggressors attacked the country.

It, reproduced on paper in facsimile, was discovered in the early period of the Ri Dynasty.

On the basis of the astronomical chart, a new one was made in 1395. It is known as Chonsangryolchabunyajido.

It reflects the celestial sphere with the North Pole in the center. Carved on the flat stone were 1 467 stars in 282 constellations, positions of vernal and autumnal equinoxes and the Galaxy.