That's actually great info for me too, and I'll keep it in mind! as my story also occurs in a medieval fantasy world.
I remember, for a mini bonus comic for my actual comic, the princess gave a sweet to her loved Knight guard. OFC I just then realized chocolate was not discovered yet, and had to look which sweet were expensive and royal. Marzipans were an absolute luxury. Sugar was "the white gold" back then, and honey was the poor man's sugar (and even with that, it was hard to get).
I needed to find a something that would explain the "disappearance" of the sun in the world, and I stumbled upon an actual historical moment of the industrial revolution(I can't find the vid rn, I think it was in manchester), where the smoke was so bad once, that the city went dark for days. That worked for my comic specifically. Also researched on how the sun waves work, the phenomena on eclipses, and how the sun is reflected into the world.