in regular events, such as the Earth turning on its axis, or 
encircling the Sun that we measure time.

&gt; Which one presupposes the other in its definition?  

MW: I guess we start with time.

&gt;Why?

MW: This is a 4D ontology.
&gt; 
&gt; John Sowa
&gt; 

Regards  
      Matthew
============================================
Matthew West
Operations &amp; Asset Management
Shell Services International
H3229, Shell Centre, London, SE1 7NA, UK.
Tel: +44 207 934 4490 Fax: 7929 
Mobile: +44 7796 336538
E-mail: