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.

Interested in learning about tonight's sky and the constellations up this time of year? Want to know what objects to look for with the naked eye, a pair of binoculars or a small telescope? In this ...