It’s #InternationalAstronomyDay, and to celebrate we have the next video from our Ancient Greeks bite-size series. This video features a Byzantine sundial-calendar, the second oldest known geared mechanism in the world. It follows an even older tradition of ancient Greek mechanical technology, revealing just how advanced the ancient Greeks were. You can learn more about the world’s oldest surviving geared mechanisms by visiting our free exhibition, Ancient Greeks: Science and Wisdom. Open until

9.4K views · 125 reactions | Skygazers: Have you made your pilgrimage...