Rated 3 out of 5 stars

Nice Addon, but its asks me for configuration on every single start?!

This review is for a previous version of the add-on (1.3.20120301.1-signed). 

Unfortunately SunCult doesn't automatically know where you are, so you must set your location.

(The config window will keep appearing if the location is not changed from the internal default)

To set the location: Right click on Suncult Icon -> Sun Cult Configuration -> Location (tab).
Then set where you live:
eg: Europe->Germany->Munich.
This should give you a reasonable position to get sun&moon times.
You many want to manually adjust the Latitude + Longitude to exactly where you live for increased accuracy.