ntp-simple 1:4.2.0a+stable-8.1ubuntu4 (amd64 binary) in ubuntu dapper

 NTP, the Network Time Protocol, is used to keep computer clocks accurate
 over the Internet, or by following an accurate hardware receiver which
 interprets GPS, DCF-77, NIST or similar time signals.
 .
 This version of the ntp daemon can synchronize to other servers across
 the Internet, or (if none are available) use your computer's built-in
 clock as a time source for a local network. It is sufficient for most
 systems.
 .
 If you wish to configure a reference clock, particularly if you have a radio
 clock, use the ntp-refclock package instead.