To clear up an important point, the inner planets not only move from an evening appearance to an morning appearance as it passes in front of the Sun but eventually move from a morning appearance to an evening appearance as it moves behind the central Sun. It is only a matter of matching the graphics with actual imaging -

http://www.popastro.com/images/plane...ary%202012.jpg

https://www.youtube.com/watch?v=MdFrE7hWj0A

It can be argued that this proof of the Earth's orbital motion is even easier than dual retrogrades resolution and the eclipse event brings it into sharp focus as the Sun can actually be seen among the grouping of stars that lie along the orbital plane of the Earth as the Zodiac.