Some Arduino libraries I thought others might find useful.
SunRise : Compute the
time of sunrise / sunset, given date, latitude and longitude.
TimeLord : Many time and
date related functions... Daylight Savings, Moon Phase, Sidereal time,
with the SunRise library rolled in.
Figuring out how to power your project with the sun.
Thermistor code generator.
Seems like there's always a lot of head scratching about it.