This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Petrus Astronomus Astronomical clock in Uppsala Cathedral. Woodcut from the th century History of the Nordic peoples by Olaus Magnus supposedly depicting the astronomical clock in Uppsala Cathedral which was later destryed in fire PDold Uppsala Cathedral Historia de gentibus septentrionalibus Analogue clocks turning once day Astronomical