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A NTP client is a program which user can synchronize the time with time server assigned. This prog

The goal of ntpclient is not only to set your computer's clock
right once, but keep it there.

First, a note on typical 1990's and 2000's computer crystals.  They
are truly pathetic.  A "real" crystal oscillator (TCXO) usually has
an initial set error of less than 5 ppm, and variation over time, voltage,
and temperature measured in tenths of a ppm (and an OCXO can reach