On Friday, October 27, 2017 at 12:36:46 AM UTC+1, palsing wrote:
Just because you think that you were the first to recognize this material does not mean you were, you were simply late to the party.

.... and in fact Gerald still does not understand retrogrades of the inferior planets even as well as Hipparchus did. When shown the actual path of Venus against the background stars, he does not believe it.