If you do not know what this is all about, you probably do not need to know!
Sometimes it is useful to specify a particular ‘Time Server’ when synchronising your computer to internet time.
One of the Cambridge time servers is a sensible choice for my part of the UK.
Cambridge, U.K.
ntp0.uk.uu.net
ntp1.uk.uu.net
ntp2.uk.uu.net
Service Area: UUNET (formerly known in the U.K. as PIPEX) and U.K.
Glasgow, Scotland: Strathclyde University
ntp.cs.strath.ac.uk
Service Area: U.K., Europe, and any
Manchester, England: University of Manchester
ntp2a.mcc.ac.uk
ntp2b.mcc.ac.uk
ntp2c.mcc.ac.uk
ntp2d.mcc.ac.uk
Buckinghamshire U.K.: Wibble U.K., Aylesbury
tick.tanac.net