1) Astronomical clock 2) Astronomical instrument
Found on
https://www.crosswordclues.com/clue/astrarium
An astrarium, also called a planetarium, is the mechanical representation of the cyclic nature of astronomical objects in one timepiece. It is an astronomical clock. ==History== ===Greek and Roman World=== The first astraria were mechanical devices. Archimedes is said to have used a primitive version that could predict the positions of the sun, th...
Found on
http://en.wikipedia.org/wiki/Astrarium
No exact match found.
