Crepuscular Moon Rays over Denmark
Image Credit & Copyright: Ruslan Merzlyakov (astrorms)
That's a very beautiful picture indeed! It looks almost like a painting. Do note Andromeda at upper left, and note how bright its center is, and how faint the disk is. "Normal" pictures of Andromeda don't show us this great contrast in brightness.
Not only is the composition lovely here, but the colors are strikingly beautiful, too. You can find the stars in the Great Square of Pegasus (which looks a little squashed) and note their colors.
There are three orange stars at upper right, and the brightest and leftmost of these is Scheat, Beta Pegasi, a reddish M-type giant. To the lower right of Scheat is a bright white star, which is Markab, Alpha Pegasi, an A-type star. At upper center, in a bluish gap between two golden-colored crepuscular rays, you find a blue-white star (with a lot of small stars to the right of it), which is Alpha Andromedae, Alpheratz, of spectral type B9. And halfway between Alpheratz and Venus near the horizon is a bluish star, Algenib, Gamma Pegasi, an intrinsically bright and blue B2-type star.
I would annotate the image and show you, except my computer is groaning under the weight of all the images I have uploaded to it! So I'll help you by adding two annotated pictures of the Great Square of Pegasus. I had to upload one of them, but at least I didn't have to add annotation:
Andromeda and the Great Square of Pegasus. Image: Whitby Astronomers.
I've got to show you a picture of anticrepuscular rays, too.
Anticrepuscular rays, or antisolar rays, are meteorological optical phenomena similar to crepuscular rays, but appear opposite the Sun in the sky. Anticrepuscular rays are essentially parallel, but appear to converge toward the antisolar point, the vanishing point, due to a visual illusion from linear perspective.
Anticrepuscular rays are most frequently visible around sunrise or sunset. This is because the atmospheric light scattering that makes them visible (backscattering) is larger for low angles to the horizon than most other angles. Anticrepuscular rays are dimmer than crepuscular rays because backscattering is less than forward scattering.
Anticrepuscular rays can be continuous with crepuscular rays, curving across the whole sky in great circles.
Did you get that? I can't say I did, but... we can enjoy the picture anyway, can't we?
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