I found this info on another site :
Civil Twilight Start: 05:08
Sunrise:              05:41
Sunset:               20:19
Civil Twilight End:   20:52
I'm using weather.com for my script but it doesn't have the details this other site has. But weather.com makes it much easier though because of its XML feed.  Anyway, it seems sunrise starts about 30 BEFORE and sunset ends about 30 minutes after. I'll script it like that.