| Currency | Koruna (CZK) |
| Facial value | 20 |
| Year of issue | 2000 |
| Metal | Brass plated steel |
| Ø in mm | 26 |
| Art.-No. | CZ20.00C |
| Price EUR | 70,00 |
Astrolabe. Astrological clock with special mechanisms and dials to display astronomical information, such as the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets. The most famous astrolabe of the Czech Republic is the medieval astronomical clock first installed in 1410 located on the southern wall of Old Town Hall in the Old Town Square of Prague.
