BBC News

Magazine

Page last updated at 12:08 GMT, Tuesday, 2 December 2008

Meeting the Director of Time

Brian Cox meets the Director of Time at the US Naval Observatory where Universal time is defined with the help of atomic clocks.

Horizon: What time is it? is on BBC Two on Tue 2nd Dec at 2100BST

Story Tools

PRODUCTS & SERVICES

Americas Africa Europe Middle East South Asia Asia Pacific