I added a "Day and Night World Map" to the Dawn-Dusk Times tiddler.
Just add this code:
It will render a map of the world with the actual day, twilight (civil, nautical and astronomical) and night areas with actual positions of Sun and Moon.Code:<html><img src="http://www.timeanddate.com/scripts/sunmap.php?iso=<<today 'YYYY0MM0DDT0hh0mm'>>"></html>
Cheers,
Jeffrey