This stone slab with the carvings of a planisphere, a chart of constellations, was made in 1396 by 11 astronomers including Gwon Geun and Yu Bang-taek under the orders of King Taejo.

The word “planisphere” means a sphere represented as a plane (i.e., a flat surface) and is more typically used to describe star charts. It is named for Alberto Cantino, who was working in ...

MOST students of the aspects of the heavens are familiar with the small circular planisphere having a revolving ... be taken off so that the whole of the chart can be seen if desired.