The stuff is all hard-coded. You can mess with the way things are displayed, but not what and where it is displayed.
Personally, I'm in aanker's corner. This isn't a solar system simulator and what we got is pretty impressive considering that it is just meaningless window dressing on the game.
Sunrise, sunset, noon times for each day? No submarine would have been without them! By comparing the difference between your sunrise and the GMT sunrise you directly work out your longitude without a lot of hocus pocus. That information was indispensable for the real sub jockeys. SH1 had it right. SH4 missed by a mile there.
Oh, I forgot. I was supposed to jump. Darn. Missed it by that much...
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