As i have not seen in any guidelines ( peharbs because i have not all books) but i whould like to contribute to the game health.
The shooting stars were well known by the ancients, and somehow not well understanded. Regardless that the ancient greeks knew that had no relation with stars and considerate them a meteorological fenomenon ( meteorites) they also asociate this , or some of them , with stones falling from the sky. Meteorite metall is known as a gift from gods since bronce age (maybe even earlier) [see "old pelion" as an example or the gift of the king of Siria to the Egipt pharaon , an iron knife, to show him "see what my army have and yours not"]
Ok, back to the guidelines that is CrAu.
I would consider a shooting star as:
- minor atmosferical phenomen so a 1
I whould consider the impact of a meteorite:
-very severe atmosferical phenomenon so a 5
( damage guidelines can maybe replicated from lightnings)
Observations accepted.
Continuing:
Those only for northen tribunals or someone who heard or read about them.
Boreal aurora: nothing to explain here if any one have historical curiosities i would love to hear of
I whould go for a guideline 2 due to the size of it in the sky.
Sun dogs: mindblowing phenomenom that; from have been able to ocurr on more meridional lands, cristian history whould have been different.
EDIT!!: i was totally incorrect with sundogs. Those truly appear in meridional zones ( such as spain) but much less often and not so beatifull as in polar territories. Hope it become ussefull, and my apollogies for the incorrect data.
Parhelion (or sundogs) apears to show up as 5 suns forming a cross. Do that on your next crusade and theban tribunal will march you ( or maybe not)
I would go for guideline 5! Strange and rare phenomenon only witnessed on circumpolar areas... If not go for one
There are other guidelines i would classify as 1 as the zenithal rainbow (upsidedown) or a moonbow
Well i hope some of this helps.