Can you provide some links to this claim?
I can supply you with the original references. I state the information in Chapter 11 of my book The Velikovsky Heresies, "What Evidence Is There That Venus Was Out of Its Orbit".
The Ptolemy reference is footnoted to Hugh Thurston's article "Unveiling Venus", found on pages 91-94 of DIO - The International Journal of Scientific History. The Copernicus reference is from Andre Goddu's article "Ptolemy, Copernicus and Kepler on Linear Distances".
We also know based on findings of the Venus Express probe that the rotation of Venus inexplicably slowed some 6 minutes over about a 12 year period, which means that its motions are still changing.
Edited 2 time(s). Last edit at 30-Oct-15 21:13 by Laird Scranton.