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Old April 20th 17, 12:04 PM posted to sci.astro.amateur
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Default The Untold Story Of The World's Most Famous Photo

On Thursday, April 20, 2017 at 10:33:11 AM UTC+1, Gerald Kelleher wrote:

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


You can tell when Gerald has no answer to a post when he starts addressing you as "son".

That clip shows an actual path of a planet wrt the stars and you do not recognize it because you do not understand what the retrogrades of the inner planets look like. You imagine that they look like the paths of the moons of Jupiter. You are wrong.

Or, if your understanding is so wonderful, please let us all know when the next Eastern elongation and retrograde of Venus will happen. Why will the retrograde not begin on the date of elongation? Why will it end before the following Western elongation?

What is the time period between the beginning of one retrograde and the next? Why is it not equal to one orbital period of Venus? Of Earth? How is it related to these?