Dear Stephen, That is fascinating. This paragraph below reminds me of your Dad's paper showing that if Mars is actually as large and as far away as MS says it is then it should be invisible. Which is caused by the inability of the eye to resolve its light. I would be interested what Regner says about that but he has quite enough to be going on with. Maybe that is why we need another 2 or 3 heliocentrists accademics on board! Jack ----- Original Message ----- From: Steven Jones To: geocentrism@xxxxxxxxxxxxx Sent: Monday, November 26, 2007 2:13 PM Subject: [geocentrism] Ships Hull for Regner Dear Regner, SNIP The above may be called the law of perspective. It may be given in more formal language, as the following:. when any object or any part thereof is so far removed that its greatest diameter subtends at the eye of the observer, an angle of one minute or less of a degree, it is no longer visible.