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Old April 20th 17, 10:33 AM posted to sci.astro.amateur
Gerald Kelleher
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Default The Untold Story Of The World's Most Famous Photo

On Thursday, April 20, 2017 at 9:15:00 AM UTC+1, wrote:
On Wednesday, April 19, 2017 at 4:00:01 PM UTC+1, Gerald Kelleher wrote:
You are the unfortunate who posted the motions of Venus without phases but with retrogrades so, like many others,you don't get a second shot at the title.

https://www.youtube.com/watch?v=IYYwNvjr7Lg


That is a clip accurately showing the retrogrades of Venus without phases, so you do not "accept" it.


What you need to do son is get someone else who has already clued into the fact that phases dictate the planetary loop of Venus observed from Earth and as that involves alternate motions against the background stars (including retrograde motion) so if you are following a graphic where the Sun is 'outside' the planetary loop of Venus then you are either ill or perhaps astronomy is not your thing -


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

Another nuisance could draw an analogy to the motion of Jupiter's satellites around the parent planet and apply it to Venus as it runs its circuit around the Sun and if he can get it then anyone can -

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

At least you brought graphics to the thread but even I feel uneasy with the fact that your only purpose in this forum is that you attach yourself to my comments. The material is meant for narrative development and especially the Earth's own orbital input which delays the actual time Venus completes a circuit and the major component is the transition of the background stars from an evening to morning appearance thereby setting the Sun up as a central reference for the phases and in turn into the proof of circuit/loop of the inner planets.

For those who can mesh phases with retrogrades the insight will open up as something new in the partitioning between the inner and outer planets by perspectives and not even Galileo got that one -

"Now what is said here of Jupiter is to be understood of Saturn and Mars also. In Saturn these retrogressions are somewhat more frequent than in Jupiter, because its motion is slower than Jupiter's, so that the Earth overtakes it in a shorter time. In Mars they are rarer, its motion being faster than that of Jupiter, so that the Earth spends more time in catching up with it. Next, as to Venus and Mercury, whose circles are included within that of the Earth, stoppings and retrograde motions appear in them also, due not to any motion that really exists in them, but to the annual motion of the Earth. This is acutely demonstrated by Copernicus . . " Galileo