Pulsar clock in Gdańsk 
The first pulsar clock in the world was installed in St Catherine's Church, Gdańsk, Poland, in 2011. It cost about 450,000 Polish złoty (approx. €110,000 or US$140,000). It was the most accurate clock in the world at that time, and the first one to count the time using a signal source outside the Earth. The pulsar signal allows it to be 10 times more accurate than an atomic clock. The pulsar clock consists of a radiotelescope with 16 antennas, which receive signals from six designated pulsars. Digital processing of the pulsar signals is done by an FPGA device.
Pulsar clock in Brussels 
- "World's most accurate clock to be built in Gdańsk". Polska Agencja Prasowa. 2010. Retrieved 2012-03-20.
- "Gdański Zegar Pulsarowy". Muzeum Zegarow Wiezowych. 2011. Retrieved 2012-03-20.
- "Gdański Zegar Pulsarowy w Parlamencie Europejskim". Gdanski Park Naukowo Technologiczny. 2011. Retrieved 2012-03-20.