I actually wrote a spreadsheet which calculates the length of the day. I
really track it in the winter, 'cause on workdays I leave home before
sunup and get home after dark... Modearately depressing and I always look
forward to more daylight.

I just go to the US Naval Observatory Web page.. input lat long and print
the resulting web page.. it is the SunRise SunSet schedule for the entire
year based on Lat Long
BT