https://sol24.net/data/html/SOHO/C3/96H/VIDEO/
When Venus comes within range of the C3 camera moving from right to left in direct motion, it appears to move slower than when it moves from left to right in retrograde motion.
The cause of this is that the distance covered is the same as objects moving closer to the observer as opposed to objects moving further away as the object appears smaller as in the case of Venus-
https://www.popastro.com/images/planetary/observations/Venus-July%202010-January%202012.jpg
All this is dependent on a basic observational fact. The change in position of the background stars relative to the central Sun, from left to right or from an evening to morning appearance, is a demonstration of the Earth's orbital motion.
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