A following up on the Solar System and the planetary conditions:
The Solar System is IMO an integrated part of the galactic rotation and as such, also an intergrated part of the central galactic formation.
I don´t think significant planetary changes have taken place since the Solar System formation came to rest after leaving the galactic center, from where it is made according to the myths of creation.
But I think that the Roman mythical naming of planets, and misinterpretation of creation myths in general, have caused some people to believe in different kinds of planetary catastrophic upheavals and in "once upon a time another planetary polar configuration", ideas to which I´m trying to give my alternative and natural explanation here.
If you make people think they're thinking, they'll love you; but if you really make them think, they'll hate you.