These Astronomical Clocks Were a Wonder of the Medieval World

http://io9.com/astronomical-clocks-were-a-wonder-of-the-medieval-world-1484069867?utm_campaign=socialflow_io9_facebook&utm_source=io9_facebook&utm_medium=socialflow

Very cool.

Posted from WordPress for Android via my Samsung smartphone. Please excuse any misspellings. Ciao, Jon