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<H2> The Basics
</H2><HR ALIGN="LEFT" WIDTH=50% ><P><BR><BR>
   In this section, we present a minimal subset of facts about the CSPICE
   SCLK system that you can get by with and still use the system
   successfully.
<P>
 
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<A NAME="SCLK rates"></A>
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<H3> SCLK rates
</H3><P><BR><BR>
   Most of the complexity of dealing with SCLK time values arises from the
   fact that the rate at which any spacecraft clock runs varies ov