Questions about time

• What is time for?
• What is a second?
• How does the atomic clock work?
• With what accuracy do PTB's atomic clocks work?
• Since when has the first atomic clock been working at PTB?
• How is time transmitted?
• Is long-wave time signal transmission still up-to-date?
• Is the second a special unit of measurement?
• Is time information also available online?
• When does the sun rise?
• What's the time in the Cayman Islands at the moment?
• Will there be a leap second any time soon?
• When does Summer Time in Germany begin and end?
• How do others handle summer time?
• What are the present fields of research of the working groups?

For illustrations and detailed information on atomic clocks, transfer of time, research topics, and more, see the pages published by the PTB Working Groups "Unit of Time", "Dissemination of Time" and "Optical Clocks"

Do you want to know more about Einstein and the time? Then visit the Einstein-online website.