Jack, A hour is defined as 1/24 hours of a complete apparent rotation of the sun?. A 24 hour day is define by the apparent rotation ..The difference between that and the stars is 4 min per day over the course of ~ 365 days that cycle repeats ..That is a year? Jack Lewis <jack.lewis@xxxxxxxxxxxx> wrote: Dear Allen, Thanks for the diagram but really it doesn't help me at all (I'm probably too thick!). I'm sure my question could be explained in just a few words. First of all what kind of clock do we use meaning how do we define what an 'hour' is? Or is an hour defined from how we define what a year is? Jack ----- Original Message ----- From: Allen Daves To: geocentrism@xxxxxxxxxxxxx Sent: Sunday, November 11, 2007 5:13 PM Subject: [geocentrism] Re: Magnitude of scale CORRECTION Jack, i attach a diagram that i think will explain the MS explination for you quite easily...