« Last post by mad aetherist on Yesterday at 03:58:51 »
But i am thinking that that ticking dilation effect must be symmetrical, ie it applies equally on approach & then on departure, & then ditto in the 2nd half of the orbit. And if symmetrical then the ellipse might not be an ellipse but (whatever it is) there aint no precession.Quotealso show how it works, ie how it changes the 1/RR relationship, or how it drags the frame, or something (ie something mechanical)(ie not an equation).My qualitative understanding of the precession is this:
- Mercury has an exactly elliptical orbit (from the viewpoint of someone on Mercury)
- However, from the viewpoint of someone far from Mercury (eg Earth or Alpha Centauri), when Mercury is closest to the Sun, time slows down for any residents of Mercury
- This means that Mercury travels very slightly further around the Sun before swinging outward to the more distant parts of its orbit.
- This means that the point on Mercury's orbit which is closest to the Sun (perihelion) moves very slowly relative to the distant stars, when measured from year to year.
My own theory-explanation is that the 43 arcsec is a secondary precession due to the primary 532.3 arcsec. I have come up with say 4 possible effects potentially giving a precession, but all of them fail because when looked into in detail i could see that they all suffer symmetry. But my primary-precession-makes-secondary-precession effect is not symmetrical, hencely it works. And it aint relativistic (not important)(just saying).
This effect is rather subtle to pick up in a single year with an optical telescope, but easy when you look over a period of a century or moreYes there might be an observation-reading showing XX arcsec of precession, & everyone might agree on that number, & the number might be true & accurate, but, it is another question altogether as to what is the root cause of that number.
- And is easy to detect when you have a space probe orbiting Mercury which returns very accurate distance measurements to Earth (as the Messenger space probe did from 2011-2015)
But i have seen graphs showing how the precession varies so much from year to year that a simple annual analysis can suggest an advance of anywhere tween say zero arcsec to 200 arcsec per century. Hencely a measured advance of 0.43 arcsec in any one year can only be a lucky coincidence.