Before you head outside, it's worth having a quick look at a planisphere. First, find today's date on the planisphere's outer ring, and then turn the wheel until the date lines up with the current ...

The “Cantino Planisphere,” completed in 1502, is the second known chart to have depicted the New World. It included unpublished information on Portuguese trade routes and the ongoing discovery ...

This stone slab with the carvings of a planisphere, a chart of constellations, was made in 1396 by 11 astronomers including ...