Arctic Nights

Adds variable day/night length based on latitude (z-coordinate) and positions the sun accordingly. Optionally adjusts the worldgen temperature so biome generation follows along.

The default setting for a full circumference is 40000 blocks, so north and south pole are 20000 blocks apart. You start (at around z-coordinate 0) in a temperate region. Moving 5000 blocks north (z=-5000) will get you to the north pole and moving 5000 blocks south will put you on the equator.

Integrates with Serene Seasons to maximize the effects in winter. Combines well with Cold Sweat to get a realistic feel for the environment.