This is an astronomical clock made by Song I-yeong, who was an astronomy professor in 1669 during the reign of King Hyeonjong ...

Copernican armillary sphere from set of two armillary spheres and a celestial globe constructed in paper on pasteboard with metal fitments supported on a decorative mahogany baluster base. Shows ...

Some of the world's first professional sky watchers were court seers and bureaucrats working for the rulers of ancient China, whose divine right to govern depended on knowing something about celestial ...

The Vault is Slate’s history blog. Like us on Facebook, follow us on Twitter @slatevault, and find us on Tumblr. Find out more about what this space is all about here. Among the many interesting ...

St. John’s College in Santa Fe, New Mexico has unveiled the only working Tycho Brahe armillary sphere on Earth. The complex device is used to target and measure distances in space, and although it was ...