With time acceleration x12 (the max), sunrise/sundown are too quick. It should be smoothed out by using a basic longer time so the transition even with max time acceleration give a smooth transition from light->dark->light ?
The very last "30 seconds" are very brutal on the brightness, it should spread across 30mins rather than 2 or 3 mins around 05h45 or 20h15 in the summertime i used in the video. So even with time acceleration at 12x, you will have a real smooth transition between light/dark.

Sometimes you cross a field in the comfort of darkness, only to be in full daylight before reaching the end of it.. can be frustrating.

Sundown

Sunrise