

Yes, but it’s not just brighter near the outer edges, it’s whiter, thanks to the inclusion of more blue light, and that less ruddy colour does a lot to affect how we see the gradation from light to dark.
They are harder to find than they should be, but there are pictures of the Earth occulting hte sun out there, and you can see how the Earth’s atmosphere is aglow with scattered sunlight. There’s more light closer to where the sun is than where isn’t. The Blue Ghost lander pictures of the eclipse are probably the most accessible right now:
The bright ring around the Earth in ths image is sunlight streaming through the Earth’s atmosphere. See how blue it looks? And how it gets brighter closer to the sun?
That’s why.
I always like forum setups where you had limited posting privileges until you’d had a couple of posts. Usually, they’d have an introduction category where you could post, and then comment on some other users’ posts, to get your post or reputation count high enough to unlock the rest of the board.
Most Lemmy sites are small enough to have a local introduction community or other ‘free’ communities for newbies to dip their toes and acclimate. They’d be good places to centralize posts on how all of this works, too.
Wouldn’t scale to large servers, though.