XSL's to get sunrise, sunset time via earthtools.org as alternative to wunderground or yahoo weather

Earthtools.org calculates for you the civil, nautical and astronomical
sunrise and sunset times. For shutters down timing I prefer the use of
the civil twilight time.
See http://www.earthtools.org/webservices.htm#sun for more info on how
to use them.
See  earthtools-sunset-sunrise.items.example how to use the xsl to set
the datetimes in items.