I run Tasco SkyWatch ( I think that's it's name, poor cousin of The Sky ) in the background in night vision mode which makes the whole computer change to night mode, predominently red hues. I use it to keep track of the sky as well ofcourse.
p.s. I like the look of DarkAdapted ( FREE ) ... downloading it now ! Thanks for the link John ! I also like the look of the Tool Kit Peter, crosshairs .... very handy .... will get that as well !