Logo of the Physikalisch-Technische Bundesanstalt
Panoramic view of the clock hall at PTB with the four caesium clocks CS1, CS2, CSF1 and CSF2.

Questions about time

Further detailed information on the subject of time is provided by the PTB department "Time and Frequency".

Insights into the fields of activity and a tour through PTB's time laboratory are provided by these videos (in German).

Einstein and the time - this is a much discussed and at the same time only rarely really understood topic. Who wants to know more, look into the portal Einstein-online.info.

Here you find answers to questions about time which are frequently asked. Please click on a question from the list below to call the answer:

Analogue wall clock with big question mark in background