Dear Allen, At last the penny has dropped for me! When I look back at other explanations, I can see that they are the same. Many thanks. How does the solar day and the sidereal day catch-up with each other over a year? I apologise to all the others on the forum, who have always understood this phenomena, for my ignorance, but up until now I haven't felt that it was particularly important for me to know. Jack ----- Original Message ----- From: Allen Daves To: geocentrism@xxxxxxxxxxxxx Sent: Sunday, November 11, 2007 5:54 PM Subject: [geocentrism] Re: Magnitude of scale CORRECTION 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.