Re: Relativity claims the corona is too thin to refract enough to curve starlight.

Mikko <mikko.levanto@iki.fi> wrote:

On 2024-11-20 21:42:37 +0000, LaurenceClarkCrossen said:
 

Jojo: In the Earth's atmosphere, the Sun is still visible after sunset
because sunlight curves down into the denser layers closer to the
surface. That is refraction.

 
In Earth's atmospere the refraction of some colors are more than some
other colors. Although atmospheric scattering makes the setting Sun
look red the last seen color can be green or blue.

Yes, see Minnaert. There are two effects:
green is scattered more than red,
but also refracted more than red.

So in green you look farther over the horizon,
and you may see the attenuated green
when the red is already behind the horizon.
This is the famous 'green flash',
popularised by the Jules Verne novel with the eponymous title.

But there are many other subtleties involved.
In practice mirage conditions are needed
to obtain sufficient brightness for visibility,

Jan
(know it only by title)