Originally Posted by north
Quote:
Originally Posted by Celestial Mechanic
Wrong. Most of the Sun's atmosphere, especially the corona through which the bending of starlight is actually observed, is a better vacuum than any we've been able to make on Earth.
explain
|
Quote:
Originally Posted by Celestial Mechanic
If you cannot understand an explanation as simple as that you might possibly benefit from a remedial reading course. I will try again.
|
Quote:
|
The corona is very thin. It is thinner than the best vacuum we've ever been able to make on Earth. You can forget about refraction (bending) due to this source.
|
sure the corona is very thin but what of the suns atmosphere before the corona ? nearer to the surface ?
Quote:
|
As for "emanations" of the Sun, light does not push light around. (There is the exception of Delbrueck scattering, but that is too small to matter.)
|
I didn't suggest that the bending of light by the sun from a star behind the sun had anything to do with light emantating from the sun
where did that come from ?
Quote:
|
The deflection is proportional to the inverse of the impact parameter, that is, the distance of closest approach of the photons to the Sun. The figure of 1.75 seconds of arc usually quoted is for a photon skimming the limb of the Sun. A star whose undeflected position would appear about twice the Solar radius is only deflected half as much, etc.
|
Quote:
|
A change in refractive index due to an atmosphere typically drops off exponentially and is only significant close to the limb of the body; as for your so-called "emanations", those would be expected to drop off as the inverse square of the distance.
|
" close to the limb of the body " ?
what does that mean exactly ?
Quote:
|
Maybe if we're lucky that could integrate over the trajectory to give inverse distance dependence but there's just one thing: if your "emanations" are pushing the starlight away the images of the stars should be deflected towards the Sun, not away from it. The path of the starlight is attracted toward the Sun so that the observed deflection of the star's image is away from the Sun.
|
the emanations from the sun are not pushing starlight away from the sun but towards it hence the observations seen by Eddington
the lensing affect by the sun