Luthier,
This looks pretty good actually but is it possible to replicate the magnifying effect of the earths' atmosphere on the visual size of the sun as it descends/rises?
eg:
That would be a first in flight sims afaik. The colours in your update look fine to me, from what I've read there's usually a lot of haze in that region during summer and it sometimes does take on a pinkish hue at dawn/dusk.