Sylvain9595's latest activity

@PeterDonis, I still don't understand why the speed would change the amplitude. There seem to be a problem here : Mars's apparent...

I admit you are right, I get it now. I was too focused on the retrograde motion for some reason...

My post 20, rough though it is, should make your assertions self-evident to all. Here, the two images are superimposed and scaled so...

@PeterDonis, 1) A widely accepted definition of apparent retrograde motion is: “Like the Sun, the planets appear to rise in the East...

I understand they're not statistically independent in practice, but I maintain they are geometrically distinct. Consider the highway...

@PeterDonis, Thank you for taking the time to pull the ephemeris data and to spell out your reasoning so clearly. The numerical values...

"OK, I am hoping that you will intuit that, for a given speed, a shorter time spent in retrograde would result in a smaller observed...

@Dave, Thank you for your thoughtful response and for offering to create a visualization—that would be extremely helpful and could...

@mfb and Dave, You're absolutely right that the relative velocity differs by more than a factor of 2 between the two oppositions, and...

Thank you for the welcome, and happy new year. I believe there may be a misunderstanding about when retrograde motion occurs...

Why does Mars show greater retrograde arc amplitude when farther from Earth (2012) than when closer (2003)? I've been comparing Mars...