Currently the mod only applies to Nauvis, and there are mod settings for all the variables. Here's my proposal to make the mod more immersive and support Space Age.

Mod settings:
A. whether you want random or chosen landing sites
B. how extreme the random landing sites latitude can be
C. how extreme the planet variables will be (axial tilt, year length, etc)
For each vanilla planet, define the default variables. Nauvis like Earth, Vulcanus like Mercury, etc.
For modded planets, use a constant random seed and the planet name to generate consistent variables
Adjust planet variables based on the extremeness setting
When the player first lands on each planet, either randomly choose a landing latitude, or prompt them for it

I'll probably proceed with this when I don't have other pressing mod work, but I welcome feedback in advance.

This is cross posted to github at https://github.com/sparr/factorio-mod-axial-tilt/issues/2